PROS - blocks the noise out pretty well and it's overall comfy (more details to follow)
923713
PROS - blocks the noise out pretty well and it's overall comfy (more details to follow).

CONS - Gets in the way when shooting a rifle and my ears get a little to hot with them on for a short while. You can barely hear your range buddy talk when he's right beside you (communication is key). I'm looking into a much smaller (wire like) style.
4297085
Great noise isolation, but a little uncomfortable after a while for me. It might help if the ear cups were a bit bigger, my ears feel a bit cramped. I only use them for blocking out background noise, not shooting or any particularly harsh noises, so I can't speak to that.
527247
I purchased these headphones because I work.  My open air cubicle doesn't do a good job of blocking noise from others.  And when someone loud spends 7 hours a day on conference calls, it can make a very long day.  The reviews that stated the headphones are a little heavy are correct, but it's not a deterrent.

Pros:
- great sound from music
- decent noise cancelling
- plug in wired option is wonderful
- pause play sensor works well (blessing and a curse) when you are legitimately removing the headset this is nice
- extended range is fantastic.  I can walk away from desk to the printer on the other side of the room with no loss of connection.

Cons:
- pause play sensor works well - when you are adjusting due to hair caught under the headphones or comfort needs, this is distracting
- tight/heavy headphone construction.  I'm hoping it will loosen up a little with use.
-
1884650
These are my first, so I really don't know how they compare to other noise cancelling headphones. What I can say, is that they reduce ambient noise noticeably, enough for me to work in a loud office without hearing my co-workers when the music is on. They are comfortable on me, but I do have a small head. I could see how they could be uncomfortably snug on anyone larger. They fold nicely, and they look pretty solid.
539493
I only got this a few days ago, but I've been making a lot of use of them, as I'm a night-owl with a penchant for rock music. :)

Quality is good -- fit is comfortable, headset is stylish but non-adjustable. They're meant to be worn with the band behind your ears. It's kind of uncomfortable to lay down or put your neck against something while wearing them because the neck gets in the way.

Since this is my first pair of Bluetooth headphones, this might be a flaw inherent in all Bluetooth headphones, or just this one, but you have to restart whatever program you were using for audio to start coming through. This means restarting Windows Media Player, or if you're in the middle of watching a YouTube video, you have to reload the page before any audio starts coming out through the headsets, not as convenient as plugging in wired headphones.
3983106
July 2014 - I have had this for a while now.  It took some getting use to when placing it in my ear.  Comes with three ear plug sizes so you have to see which fits best for you.  Does a good job canceling out the noise.  I also have the Bose Quiet Comfort 20 that covers the entire ear.  But that does get hot at times.  And it's difficult to sleep with those other ones.  The batter pack does get in the way.  It would be nice if they figured how to make it slimmer.  The L shaped jack makes it difficult to plug in to some electronics.  They could have just made it without the L shape.

Overall, it does what they say and it works wonders at silencing out noise.  Also does a good  job when you listen to music or movies on your iPad, or iPhone, etc.
4009290
For the price (I paid about $20) they're fantastic headphones with a very long cord. The actual noise-cancelling features, however, don't seem to do much of anything. In fact, when the noise-cancellation is engaged all that happens is the volume is made about 30% quieter and a hum is added. The white noise can help to drown out background noise, though. However, the noise isolation is great; they're very comfortable and fit around my ear really well. I forget I'm wearing them a lot.

Pros:
- Comfortable fit
- Good sound quality
- Nicely foldable
- Long cord

Cons:
- The noise cancellation unit is on the cord and can be tricky to negotiate (I've thought about cutting it off and re-splicing the cord
- Build quality :/ The wires are showing on some of the joints. They've been so for months and haven't broken yet, though.
- No microphone
2424714
Overall, great product that minimizes white noise and regular noise. I recommend more for concerts, music and concentration moments.

Two things I didn't like (mainly associated with sleeping):
-The buds stick out a bit far for comfort -- mainly bothersome for sleep since I like to sleep on my side.
-Doesn't eliminate all noise -- mutes voices but can still hear people if trying to sleep.
4627459
It's not super quiet when you put these on but It works enough to protect your ears. It's also extendable. I almost thought it wasn't until I was looking at it for a while and found out how to extend it. It's also pretty small which is a big plus for carrying.
4971389
I have absolutely no complaints about the sound quality of this headset.  I'm not exactly an audiophile, though, so others might know better.

The padding's a wee bit uncomfortable on my gargantuan ears, but I got used to it alright.

But I've gone through three of these because the extendable portion of the headband snaps too easily.  Maybe my cranium is just too large (it is pretty big), but be prepared to bust out the duct tape and maybe some stiff wire, 'cause these will probably break on you too.
1107832
The ear plugs definitely help block out ambient noise! These are pretty comfortable to sleep with for the most part, but sometimes they can bother me when sleeping on my side.
3490061
Just picked up a pair.  I haven't tried any of the higher end noise canceling headphone so I have nothing to compare it to.  The noise cancelling works well.  It doesn't give you total silence around you, which was kind of what I was hunting for, but it definitely gets rid of most of the low level background noise.  For example the window AC unit can be heard droning on in the background.  It gets rid of probably 75% of it.

Between the noise cancelling and some music you are pretty much in your own world.

The only downside to them is that they are not man sized headphones.  I am 6' tall  and wear a 7 3/4 inch hat or a XL motorcycle helmet.  They are bit snug and unless they loosen up some I foresee them becoming pretty uncomfortable after an hour since they squeeze my glasses against my head.  (UPDATE)  I've worn them now over an hour and as long as they are not directly on my glasses frames they aren't too bad, but I would still prefer them to be snug rather than closer to tight.

I love the wireless.  Can't tell you how many times I've had headphones or ear buds ripped out by the dog.

Would I buy them again?  No, not unless they came in a larger size, but I am going to keep them and make do until something better comes along.
1436260
Overall I'm happy with my purchase. Below are the cons and pros to my opinion:

Pros:
Very comfortable; no pressure on the head, not warm.
The headphones are adjustable. You can adjust them to be placed right on your ears.
Inexpensive.
Cons:
The headphones are not like in ear buds, so you will need to turn up the volume a bit to hear the music. However, I guess they were not designed to be in ear, since they are meant to be comfortable enough for sleep.
For the above reason, you will hear outside noises more than you would with in ear headphones.
The  headband is slightly big for my head so it moves around my head when I'm sleeping.
259832
These earphones fit quite nicely and - as another reviewer said - they are comfortable enough to wear to bed.  For non-powered earphones, they do a nice job of blocking outside noise.  My one quibble is that when the cord is bumped (like if I'm running), the sound of the bump comes through the earphones a little too loudly.  They're not the best earphones out there, but I'd highly recommend them for the price.
913849
If you put a little sound through them they block out almost everything around you and have pretty good sound quality for the price.
3724632
head phones block out external sound well, loud, crisp audio, comfortable adjustable fit, battery cover can be a bit tricky
3775713
Works as intended, but it covers the speaker.