Sound and voice quality is fantastic, the mute button is always within reach
585671
This is the second time I have purchased this headset! Sound and voice quality is fantastic, the mute button is always within reach, and there is plenty of cord to let you move around. I use this headset for gaming, and I picked it above all the other products out there...again!
2929399
I actually picked this guy up at Best Buy (big mistake - they're $100 there) and even though the price is substantially higher there, I'm still very glad I bought it.

SPEAKERS
The speakers are large and the padding doesn't even touch your ears, only around them. This is perfect for people with glasses as smaller headphones tend to dig the earpiece of your glasses into your head. They fit comfortably and are not too tight at all. I can watch multiple full-length movies in a row and forget they're even on my head, and I have a large head.

MICROPHONE
The microphone is well hidden inside the headset and easy to pull down when you need it, and it extends out a little if you want. The microphone is very clear and loud even when not extended, and it does a good job of filtering out any background noise including your breathing. My online friends immediately noticed the massive improvement in voice quality when I spoke to some of them.

SOUND QUALITY
As soon as I plugged these in, I pulled up one of my favorite songs to test them out. It was outstanding. I've been through many headphones and none of them came close to the quality in which these do. The bass sounds very nice, especially with explosions. I hopped on a game to test them more and decided I'd be keeping them instantly. The sound has a way of enveloping your head even in stereo, and if you're talking to someone over VOIP then it literally feels like they're talking with you face-to-face. The quality and enveloping of the sound is so great that I tend to look around, thinking everyone can hear what I'm hearing. Just to test this I took them off and you can't hear a peep out of them.

FEATURES
The headphones are designed so you can hear everything happening in reality. If you have the volume cranked up (they can get very loud) you probably won't hear much short of someone banging on your door, but other than that it's great. The speakers come with two jacks, one for the microphone and one for the speakers. You can either plug them directly into the back of your computer for stereo, or plug them into the USB dongle for surround sound if you have a Dolby-capable sound card. There's a 'control panel' of sorts on the wire that can clip on your shirt if you like. It controls the volume via a rotating circle and can mute the headphones with a sliding switch. The volume can be turned up very loud and it's hard to accidentally turn it up or down, which is good. The dongle comes turned off and the microphone switch comes on mute so if you get one be sure to flip both of those switches.

FINAL THOUGHTS
Although I paid way more money than these are selling for on this website, I'm glad I bought them. Happy enough to where I decided I really wanted to review them, which I've never done with a product I haven't boughten online. They're very good headphones and they're well-made. They're comfortable, sound awesome, and are extremely simple to use.
1774496
I've had it for less than a week, but I've logged 20+ hours with it already. Right off the bat, let me say that so far I like it way better than the Motorola S9-HD it's replacing. The sound quality is excellent, battery life is great, nine times out of ten it makes the bluetooth connection to my phone (iphone 4) within a second or two of turning it on, and the wire across the back - instead of a continuous arc of plastic - makes it more comfortable; I can actually lean my head back, against a headrest, a pillow, or whatever, and not have the piece across the back of my neck push the whole unit forward, forcing the earphones out of my ears. One of the best things though, is that it seems to have a much stronger bluetooth signal. My old headset would drop out constantly when I would listen to audio outdoors with my phone in my pants pocket. Not so with this unit. There's still the occasional drop out, but nothing like before, when I had to hold the phone up by my chest to keep the sound from dropping out every few seconds. Likewise, I couldn't use the old headset around a running microwave. For this headset, microwaves are no problem. I've seen some other reviewers complain that it's a pain to put on. Well, I had to agree with them at first, but after a little practice it only takes a couple seconds. The only other thing that took some getting used to were the buttons on the left earpiece. Not that they're difficult to use, they're just difficult - at first - to find by feel alone. If I were to change one thing about this headset, it would be to make the buttons a little more prominent, but even that's not a big deal. Overall, Plantronics seems to have done an excellent job. I can't speak to the longevity of the unit yet, but given the quality and attention to detail I've seen so far, I don't anticipate it will be an issue.

UPDATE - 11/13/2011
After five more months of nearly daily use, I have to say that I stand by my initial review. I love this headset. I haven't regretted buying it for a minute, and would unreservedly recommend it to others.

UPDATE - 4/15/2012
Well, a few more months, and it's given up the ghost. The joint between the piece over the top of the ear and the piece behind the ear came apart, first on one side, then the other. I was able to successfully glue the joints back together with superglue, but I guess the stress on the wires when it broke caused some damage, because the unit started turning itself off at seemingly random intervals. I only decreased my rating by one star, because I feel like the issue was partially my fault. I have to say that I liked these well enough that I'll probably get another pair, but I'll definitely be more gentle with them the second time around.
3148951
Music sounds great, phone quality grear,stays put while working out and working around the house/yard, good talk quality from what I'm told: no one knows I'm using headset unless I announce it.

My only complaint is that the rubber flap that covers the charging port is difficult to pry open: I use a paperclip, but not worth docking a star.  I've been using them heavily for app. a week, so far great product.

I'm considering buying a batch and giving them out as gifts.
4470664
PROS:
-Easy operation, intuitive controls
-Good sound quality for calls and music
-Microphone works great
-Comfortable and lightweight
-Minimal noise isolation
-Great battery life, recharges quickly
-Clear notifications for battery level and incoming calls
-Impressive range
-Collapsible, fit easily in pants pocket.

CONS:
-Can become uncomfortable after extended wear (4+ hours)
-Minimal noise isolation
-Track forward/back takes too long
-Mic can pick up outside noise when unit is idle

I have used this headset 4-5 days a week for just shy of a year now and I'm happy to say it is still going strong. I work in an assembly environment that involves a lot of movement, and wired earbuds or headphones constantly snag, get caught, or yanked out of my ears. The Backbeat 903+ has been the perfect solution. It allows me full range of motion without worrying about cords, and control of music and phone calls without digging my phone out of my pocket. The audio quality is great- admittedly, I'm no audiophile and no doubt it will not compare to high-end wired headsets, but to my ears my music sounds rich and clear with a respectable amount of bass. Voices come in clearly when listening to talk shows or watching Youtube videos. The controls are a breeze to operate- interruptions are frequent in my workplace so I love being able to pause whatever is playing with a quick tap or adjust volume on the fly. When making calls on it, others report to me that they are able to hear me very well.

Above I list "minimal noise isolation" as both a pro and a con- these don't do much to drown out ambient noise unless you turn up the volume, which can be negative; in other applications though, like my own jobsite or someone going for a run, the ability to hear what's going on around you is crucial, and this headset is designed with the latter in mind.

Voice prompts inform of the battery life when the headset is powered on and updates are provided by a tap of the power button; there are also prompts to notify a successful connection, low battery and incoming calls. The headset meets its promised 7 hours of listen/talk time and while the description says it fully charges in 3 hours, in my experience it's a even less than that.

The 903+ paired quickly and easily with my DROID phone. I do infrequently have moments when it gets "out of sync," usually when I pause something from the headset and try to resume it from my phone; powering it off and back on solves this and only takes a moment. The range for the Bluetooth connection is very impressive, more than 30' before it begins to cut out. It allows me to leave my phone somewhere to charge while I'm working while still hearing my music.

My biggest gripe is the track forward/backward function. It uses the same control as the volume, so to differentiate commands volume uses a tap, while track skip uses a long press of several seconds. I wish it were a bit faster, or maybe used a double tap instead. My music player tends to only go back as far as the beginning of the current track, unless you hit "track backward" within the first 1-2 seconds. This is a problem when the headphones require at least 3 to initiate the command. It's a minor issue and not one that would make me hesitate to buy this again.

There is one quirk worth mentioning: when not in use (i.e., powered on but no active music or phone calls) the microphone has a tendency to pick up loud noises and play them directly into the right earbud. It can be a little startling so I've made a habit of popping the right side out of my ear when the headset is idle. Fortunately the over-ear design makes it easy to remove the earbud itself without taking the unit off of your ear, and it can be re-inserted without having to fumble for a dangling earpiece as may be the case with in-ear style headphones.
3303953
I have had this for a few weeks now and I seem to keep finding features. I just learned that if it is sitting on my desk and my phone rings, all I have to do is put it on my ear and I hear Answering phone and it answer either my computer or my cellphone without touching a button. I also like the dedicated mute button. It is the nicest headset that I have had.
4715670
Pros:
Easy connectivity
MicroUSB charging
Audible notification of connection/power level
Magnetic earbuds
Very durable

Cons:
Volume too low for loud background noise (lawnmower, etc)

I have been using this bluetooth headset for almost 9 months, and they're absolutely wonderful. I use the headset almost daily, and it looks and functions as if it were brand new. The construction is very durable, and has handled every abuse I've thrown at it. Connectivity is very easy, at least for the iDevices and PC I've connected it to. It utilizes a microUSB port for charging (see photo) and a full charge easily lasts me several days, then only takes a couple of hours to go from zero battery to full charge. There's also an audible notification when you turn the device on of its power level and whether or not it connects to a device. Finally, the magnets holding the earbuds are perfect for keeping the cords out of the way. I've tried two other cheap models of this type of headset and the magnets wouldn't even hold the earbuds.

The only bad thing I have to say about this device is that, when working around very loud background noise (think lawnmowing), the volume from the speakers isn't loud enough to overcome the noise. This is probably a safety issue more than anything, though, so I can't really take any stars away for this.
3396568
I really like the H800.  The sound quality, comfort, and convenience are outstanding.  I only have one item that I think can be improved.  The switch used for turning the H800 on to Bluetooth or USB is very hard to manipulate, especially if you are wearing the headset.  It's nearly impossible to switch from USB to Bluetooth while wearing the headset.  The difficult On/Off switch is annoying.  I think they could do a better job with that switch.  Other than that minor complaint, I think the H800 is outstanding.
3982070
The sound quality is very good. But the only draw backs are, there is no mute button. It gives no warning signal when it is about to die .And the comfort level is kinda harsh on your ears and there is no way to adjust it to loosen it on your ears.
2694436
Mute Button is sometimes inoperative.
When using skype the mute switch on the handset doesnt control skype mute button.
The volume switch awfully close to the headset making it uncomfortable to use.
3675512
Maybe I'm showing my age, but I still have a land line.

This phone has excellent sound quality, and the cordless units have excellent range across floors.

But the most remarkable feature of this phone is the Call Block button. I never imagined a feature on a telephone would bring me inner peace, but I cannot find the words to describe the feeling of satisfaction I get every time I press the Call Block button to cut off a spam caller. Poof! The phone disconnects the call, and the spammer can't call back.
724695
I am going to start this off by saying I received this product for free to test and give a review.

Pros:
- The voice quality is very good, probably the best out of any microphone I have owned.
- The mic was as simple as plug and use, however I did also download the application it recommends. The application itself is pretty basic and seems to only have one function, to calculate and reduce background noise.
- The volume button on the top is really nice, makes it so I do not have to alt+tab out of games in order to adjust my volume.
- The mics LEDs change color to indicate a high level of sound being broadcasted, which served less as a "I am too loud in discord" indicator and more as a "Its 3am and other people in the house can probably hear me" indicator.
- It is a good looking mic, pretty sturdy and has a piece of soft foam on the bottom of it to prevent sliding.
- Cable length allows relatively good options for movement of the microphone. My tower sits on top of my desk, however if it was on the bottom shelf or on the floor it would not reach to its current position, I would need a USB extender.
- I play fighting games with mechanical buttons and my old mic would pick up both the joystick and the buttons, where this mic picks up neither.
- It comes with a cool little magnet (in the plastic bag on the picture). I enjoyed pulling the plastic coating off of it and I use it on my fridge.

Cons:
- Mute button is a little finicky. Sometimes I find myself pressing it relatively hard 2-3 times before it actually will mute.
- The mic does such an amazing job of picking up low frequency sounds (similar to your voice) that the mic actually picks up the vibration of my computer fans being transferred through my wooden desk. I have it sitting on three pieces of foam and it still buzzes enough to hear while I am speaking. Sitting it on my bed next to me the mic is just far enough to go in and out, so I struggled to find a good place for it. With push to talk or using an application that has very good input sensitivity settings like Discord this isn't an issue as it only pops up when talking and your voice is much louder than the buzzing. However, I am the type of person who wears headphones and I prefer the option of hearing myself talk and I can constantly hear the buzzing in my own headset. It seems I am in a huge minority for using this setting though, so this is also not a massive issue.

Other:
- While it does not pick up my stick, the mic picks up my keyboard very clearly. Every mic I've ever had has done this to me so its not really a downgrade or something negative, just something worth noting.

Overall, this is a very good mic. It is well built, has minimal issues that only affect a specific group of people. If you are a person who prefers standalone mics or doesn't really have a preference then this is probably a good option for you. However, my preference has always been to headset microphones and this mic isn't so over the top amazing that it would make me want to change.
2338739
Yes works like a champ but only thing is if they can add the feature for mute it would be nice.
4578718
Sennheiser recently upgraded me to these headphones because I owned a pair of the MM450X wireless, bluetooth, noise-cancelling headphones that had continuous problems holding the bluetooth connection to my phone.  In fact, I went through 3 pairs of the MM450X headphones until I gave up.  I was impressed that Sennheiser responded so quickly with an upgrade.  So, that being said, how are these headphones?  The sound quality and noise cancelling are absolutely outstanding.  I can hear music in my favorite songs that I didn't even know existed!  Also, I travel a lot and using these on planes is brilliant because they really do cancel out nearly all the roar and general noise of an airplane.  So, for these reasons alone, I love them.  However, I have to say there are a lot of bugs with these.  You power them on and off by rotating the right ear cup, which, on its own, is kind of cool.  However, when you wear them, and turn your head, and thus the earcup even a little, they register the movement as you wanting to either cut the power, or pause a call or a song.  Thus, I am constantly battling with calls being put on pause when I turn my head even the slightest.  It is SUPER, SUPER frustrating.  This happens with songs as well--the song will get paused when I turn my head too quickly so I am constantly tapping the side of the headphones to start things up again.  It makes me look like I have a weird tic.  Finally, the bluetooth connection, while better than the MM450X, can be weak, especially if the phone is in a pocket.  Because of all of these issues, I basically have to carry my phone in my hand while using the headphones for music or calls which, in effect, completely defeats the purpose of having wireless headphones.  Finally, the last incredibly annoying issue occurs when I use them with my Mac--the first time you turn them on and pair them to your Mac, they immediately trigger iTunes to open and start playing a song.  Sadly, this continues to happen over, and over, and over, and over, and over, and, well, you get it.  So if I'm trying to watch a movie on my Mac, and I move my head too fast right or left, iTunes will open and start playing the first song on my playlist--YOU CAN'T TURN THIS OFF--I know, I checked all the forums.

So, all in all, they are amazing at making music sound like it is supposed to, and the noise cancelling is probably the best on the market, but the bugs in the system are incredibly frustrating and should give you pause when thinking of buying them.

Update, Aug 2017--finally went back and saw some of the comments about turning off the smart pause. I did that, and it fixed the issue.  It's too bad that you have to turn this feature off though as it would be cool if it worked properly.
1805788
Looks absolutely amazing. Sound quality is excellent and the ear covers are super comfortable. The mic picks up very well which can most certainly can include near by sources so be aware. The only minor problem I would note for me is the volume control and mute part does not have a clip and it sits right at elbow level and arm of my chair. I have accidentally muted myself and my sound a few times. But there are ways to fix that so it's not a huge deal, just notable. Overall super happy with it.
2857684
Audio quality is great and battery life is amazing. I do wish the on/off and alert sounds were simpler. Instead of just simple beeps or tones, there is a longer audible track and low-def voice.
1094608
Completely worth the money, sound quality is phenomenal and after the firmware update the mic quality is flawless. Never had a problem with any wireless reception or anything to do with the wireless

Some Cons:
The battery life is kinda short considering my job is on the PC, using the PC for 8+ hours a day
The only real complaint I have is that when I talk, there is a very very slight tone in the right ear, when listening to anything it's not audible but when no audio is coming from the PC it is audible.