For what it's worth, these headsets do have one of the best noise cancellation I've used, and love it while travelling

The sound cancellation is really effective.

Excellent noise cancellation

Spectacular noise cancellation.

Excellent noise cancellation

Outstanding noise cancellation

The good: Noise cancellation works very nice

Fantastic noise cancellation

Bose is definitely one of the best when it comes to noise-cancellation

The sound cancellation of outside noise is impressive and they fit comfortably

Overall, though, I love the noise cancellation, it is amazing how much it cuts out and I can wear them for several hours without them bothering me.

They provide a rich sound quality as well as convenient noise cancellation

These cancel a ton of aircraft noise, though you will hear people's voices fairly clearly as the noise cancellation has trouble with those unpredictable sounds and I am not sure how strong the passive cancellation is, it probably could be better.

if you can only afford one set and need noise cancellation features as well as excellent sound, then don't hesitate with the Bose.

Now, what I don't understand is, I used my WAY LESS EXPENSIVE Sharper Image cancellation earphones with my Sony CD player for YEARS at the gym, with absolutely NO problems

Great comfort and noise cancellation

It is great Noise cancellation headphones

As far as I can tell, its the best active noise cancellation for the price.

Better noise cancellation in this version.

They have excellent noise cancellation

These cancel a ton of aircraft noise, though you will hear people's voices fairly clearly as the noise cancellation has trouble with those unpredictable sounds and I am not sure how strong the passive cancellation is, it probably could be better.

Very comfortable and noise cancellation works very well on airplanes and people speaking.

Excellent noise cancellation

These headphones provide some of the best sound and noise cancellation that I have experienced

Great sound quality and noise cancellation but the wire connection shorts out at the headphones

Very comfortable and noise cancellation works very well on airplanes and people speaking.

My cheaper headphone not only sound better, but the passive noise cancellation is better, and they are made with much better material

Good sound, good cancellation.

So I like the additional versatility of this pair in addition to the fantastic noise cancellation.

Sound cancellation is the best I've yet and the pair and comfortable and somewhat durable

Its still the best noise cancelling headset, cancellation wise even better than before

Check the web for pervasive known problem with losing all sound and noise cancellation in one or both sides.

I use them on the subway and plane and the cancellation is great

Great sound quality and noise cancellation

Well, I mean, be aware you are paying mostly for the fancy noise cancellation

great product.excellent noise cancellation

At its smallest setting, the headphone still didn't fit closely enough to my head to provide effective noise cancellation

what noise cancellation

I tried these and the Beats Studio 2.0.QC25s compared to Beats Studio:-QC25s have better noise cancellation.

Great noise cancellation normal temp & noise

But, other brands have good noise cancellation

However, I have a few things to share after several months of intensive use:First, it's "noise cancellation" and not "sound cancellation"

Superb noise cancellation with these headphones

Good noise cancellation is good company is

Sound qualtiy for music is a solid 4 out of 5 stars but the reason to buy these is for is the exceptional active noise cancellation

sound cancellation is outstanding

Unbelievably good noise cancellation on these headphones

These are absolutely comfortable, sound almost as good (more detail below), great noise cancellation, and the battery life is great.

Excellent sound quality, good noise cancellation and very comfortable

My desk happens to be near a loud a/c unit outside the other side of the wall

I was very happy with the performance of my headphones, but one of the speakers/drivers failed a shortly after my warranty ended

It apparently works as he has to tap her on the shoulder to get her attention... when he's sitting right next to her!

I also use these for gaming at home as well as on the airplane whenever I travel

Love them for noise cancelling as well as for phone calls

I frequently go on two-hour car rides with my family and the noise canceling really blocks out noise in the car as well as on airplanes

The movies are where bose really shine as they deliver very clear stereo separation and vocals

My desk happens to be near a loud a/c unit outside the other side of the wall

I was very happy with the performance of my headphones, but one of the speakers/drivers failed a shortly after my warranty ended

It apparently works as he has to tap her on the shoulder to get her attention... when he's sitting right next to her!

I also use these for gaming at home as well as on the airplane whenever I travel

Love them for noise cancelling as well as for phone calls

I frequently go on two-hour car rides with my family and the noise canceling really blocks out noise in the car as well as on airplanes

The movies are where bose really shine as they deliver very clear stereo separation and vocals

Overall sound was NOT as loud as I like (these don't go to 11