Good if you want to go deaf Prematurely.
356318
Worst ear plugs ever. I used them once at the indoor range. They were in my ears properly. We tested them three times before walking into the range. We shot for about an hour. Back in the car, I removed them. My right ear couldn't hear a thing immediately! It took another 24 hours for my hearing to come back. Packed them up and shipped them back. I then ordered the Deciibullz Custom Molded ear plugs. They are a fraction of the price and they actually protect your ears. Don't waste your hard earned money on these unless you want to go deaf. I was not given them either. I paid with my own money. If I could, I'd give a negative rating.
1611178
I am deaf in one ear, and have been looking for headphones that allow me to channel the stereo through on ear... this does the job.  Sound is adequate, but not great.  The biggest problem however, is that the headphone are on the ear, not over the ear.  After and hour or two, this causes quite a bit of discomfort.  If you have small ears, or if you only need to wear them for a short period they may be alright for you.  I will continue to use them until I find something better.
3730367
How about a load of white noise amplified in your ear.  Sorry to say but the quality of sound is horrible.  You get amplification at the expense of being able to understand anything.
If you are buying this for a senior citizen you may want to look somewhere else.  The will hear a mess of noise but understand nothing.
2801325
If you buy these to listen to music , they are great. If you want to talk on them , then don't waist your money. If there is any background noise at all the other person has a hard time hearing you. You have to almost yell so they can hear you.
4641544
These headphones are great for mild listening in quiet places.  I live in New York.  I got them for a wireless experience while commuting and the sounds quality just isn't very good, especially in louder areas (sidewalks and subways).  The connection quality and battery life is great and reliable, but the way the earbuds fit into the ears isn't very comfortable or very good and the bass quality is simply terrible, very distorted.  Better to have good sound than no wire connected to my phone.
3972995
In short: Returned for refund.
Here are more details.

Intended purpose: Listening to TV while the TV sound is muted to avoid disturbing others.

The good: Easy to install.  Contrary to some other reviews, could hear it in any position and any place in a big room. Sound is loud and rather clear.

The bad: (1) The biggest problem is hight frequency hissing. It is always there and it is loud enough that can't be masked by the actual sound.
(2) I could not figure out how to connect the base in the way that to hear the sound while TV is muted. When connected to the TV, the earphones will mute together with the TV.  Connecting to the DVD player is a pain, as you need to disconnect the TV (unplug the leads).
(3) Kind of tight on the head and I wouldn't be able to keep them on comfortably for an hour. (My wife said the same and her size is M.)

I would recommend the product only as a sound enhancer to a person with a relatively small head who has some hearing disability and can't hear high frequencies.  Otherwise you will be annoyed very soon.
4697968
The noise cancellation doesn't work very well. If my fiancee watches TV next to me, even with some music in the headphones I can still listen to what they are talking about.
The quality of the sound would be good if only the little switch on the side (with with you select the noise cancellation mode) wouldn't have broke after a few months of use. Now I need to play with it to find the position where the contact is ok. If not, not only the noise cancellation stops but also the music, it just goes to mute.
I don't think I overused or was brutal while using this switch. I used it maybe twice a day and it's pretty stiff so you really have to push it hard.
I'm really disappointed. I'll have to throw them away since they not even good to listen to music now.
585779
Good sound quality, gets a little uncomfortable but that depends on your head. It's got padding so it's not anything debilitating.

Worst parts about it that make me wish I had maybe gone for something else:
The microphone has a hiss, it can apparently be remedied by using an external USB power source (one that's different than your computer) but that's a bit of a hassle since the USB is tied so close with the Audio/Mic outputs. I've had people in skype complain about this and the only way to fix it is to turn down your mic volume. You can also here the mic input through the headphones which is kind of weird but you get used to it. Unfortunately, the sides' plastic is a little frail, I've only had this set for 6 months and one side has partially snapped just from regular use.

All-in-all, it's okay, but I feel there are probably some better options out there, especially at this price.
4796114
This speakers are alright if you don't want to turn up the music.  If I have a song I bought on iTunes, turn iTunes up all the way, and turn the speakers just below half way up or higher, the music ducks in and out around the bassline (which isn't very deep).  Furthermore, some songs just don't sound right.  For example, the song "The Allspark" by Vandalyzm sounds great in my Bose earbuds, but when it's played through these speakers, the audio becomes very faint.  Other songs just lose bass entirely.  I should note I listen to all sorts of music including electronic, alternative, folk, rock, and hip hop.  If you just listen to soft-alternative and folk, these will probably do fine - at moderate to low volumes, but otherwise I'd go with something else (my Harmon Kardon sub was excellent).  Obviously these aren't speakers made to get a party going, but when I'm cleaning the house and wanna turn on some tunes, I don't want to hear music fading in and out and audio ducking behind weak bass.  It's almost as if these speakers were designed to work with a sub.  Think of them as your computer speakers with a little bit of bass.  Amazingly bad from Bose.
3726005
I am a consultant, I may be commuting up to a third of my day. My car is somewhat loud, at a mile a minute. I need serious volume in my ear when conducting serious business on the open road. Folks complain that they can 'hear themselves', and it handicaps our ability to conduct our aforementioned serious business. Clearly the phone can't even cancel it's own noise. How silly is that? Surprisingly silly, for me. Seems like audio electronics, 101. Cardioid sensitivity patterns, anyone?

Battery life is good, call quality is good.

Noise cancellation is poor. Aside from the example above, while you don't hear wind when I am in a windy environment - well, you don't hear me talking either, unless I bellow like Brian Blessed. Which I like to do, but this is a review of the product, not my proclivities to imitate.

Will try something else, next time.
2883282
Ok for ambient outdoor listening/nature walks, such as hearing amplified nature sounds-probably a 3-4 star in that aspect. Not good for amplifying voices or trying to catch those missing bits of conversation as long as you are anywhere remotely near any kind of electronic devices. An idle computer, even a distant fan or usually silent air purifier will drown out the sound of any voices. There is no documentation or instruction on how to properly adjust the tone setting. Given many people have certain tone loss (low/mid/high), having some guidance in this area would be beneficial. Keeping the volume low isn't a benefit if you can't properly set the tones...since you can't hear...what you can't hear! BE VERY CAREFUL when trying to fit in your ear. Even the slightest lingering of your finger over the device will create a very painful high pitch ring that probably damages your hearing even more!

If you think this is better than nothing, and worth a try, it really isn't. If it 'sounds' too good to be true, it probably is.
101953
The Operations Manual closes with the remark that the device is not a hearing aid for those with impaired hearing.  I am not sure what to make of this, since I bought the product because I have been havinga bit of trouble hearing what people are saying these days.  But the device does amplify sounds and I will see how it does when having dinner with people who are talking.  The volume control is impossible for me, with big fingers, to manipulate while the device is on my ear, and I fear to do so because inadvertently setting to high (1 thru 8) setting is deafening and results in extreme feedback screeching.  While on volume setting 4 (of 8), the device screeches if I put my hand near my ear.  At volume setting 2, I can hear the cyclic throbbing of the house furnace fan and the mobile home exhaust-fan-timer motor and ticking around the corners two rooms away ... so, for sure, the device amplifies sound.  Inability to adjust while on my ear will limit the device usefulness as I move from one environment to another.  I really would like to use the amplifier at the local dance hall to help hear conversations across the table, but I fear that the music from the band will be just overwhelming.  Both wife and myself tried the device (one device, then both) while watching TV show.  Improved the mid range tones (typical of voices) but did not help enough. We still resort to  closed captions.  Maybe we will experiment some more and get to like the devices. This is our first experience with this type of thing, had them only a couple of days, and if we get to like them I would update this review.  We are age 75.
4664756
The characteristics of this headset are quite similar to digital radio transmissions, there is no soft fail, it will work up to a certain distance and then drop off suddenly.  Unfortunately the caller on the other end will start to hear weird radio noises before you hit that range limit and it is quite annoying since you won't hear them as well, only they will.  I rate 3 because it has bluetooth mode and the foam surrounds allow your ears to breathe if you tend to have long conversations, avoiding the sweaty ear problem of other wrap around or leatherette based headsets.
2241087
The wire is made of a sticky/grabby rubbery material that seems to reach out and grab everything it gets near, then tangle itself with almost comical complexity, making this product a an excellent jungle predator, but pretty lame for listening to music. in short, it's not worth the effort required to manage it each time you go to use it.  furthermore, just one month past the 2-year mark (i.e. warranty expiration), one channel died.  now i have left ear only.  for $76 i only get 2 years? not cool. sounds like sennheiser have fallen on hard times, and have chosen the shortsighted path as a result, that is, managing financial results rather than shooting for product excellence. one more thing, if you sweat a lot, the sweat will interfere with the sound.  this may be a universal fact and not a flaw of this particular product, but either way, having to take out the earpiece and dry it, then dry the inside of your ear, and your head repeatedly, all in the middle of a workout, sort of wrecks the purpose of the product.  aside from all that though, they do fit comfortably and sound good.
2325654
The sound is great whether talking or listening to music, but it's an uncomfortable little rascal.  I tried all the different ear pieces and they were either too small, too big, uncomfortable or fell out of my ear.  So I chose the lesser of the evils, I use the uncomfortable one.  The quality is good enough that I put up with the discomfort and take it out unless I'm talking or listening to music.  One great feature is how quickly it connects.  Flip it open and you're connected (actually it connects the call but you can't actually talk or hear the other person for about 2 seconds).
3022641
This item gets 3 stars from me because it works well, and it's got lights inside to let you know it's operating, or ringing even if you are deaf you may notice the light - especially in the dark. For that it's a decent product. Despite having 56 different "chimes" or what ever you want to call them, the tone is the same so if you test them all momentarily, they all blur together and sound the same. This product is loud enough to hear all over my 1700 sq-ft ranch home and it's plugged in centrally. The ability to change the chime, is ok if you get bored easily. The double sided tape provided is not going to stick to anything other than brand new, dry, unpainted wood or something similar. Save yourself the aggravation, and install the screws if you want to count on this thing being where you installed it when you go to press the button.
237627
I consider my head to be of average size, I don't have a huge melon, nor is it narrow. Unfortunately, after about an hour of usage, these like to make my ears go red and numb and then sore. They're just too tight, and for that, one star off. I have tried, without success, to stretch the head cable. Maybe I will put these on a bigger mannequin head and see if they will stretch over time :-). The sound quality is pretty decent and the loudness is better than some of my other bluetooth headphones. They connect pretty quickly to whatever source I grab. I must be a headphone snob, because I have not found the truly perfect pair of reasonably priced headphones yet.. I know they're out there, but these are not it.