Pros: Excellent job of cancelling noise
Cons: Cannot use at all when cancelling turned off
These are great for use on transit, airplanes, or other situations similar. They do what say, and in an excellent way. Since there are so many positive reviews, suffice it to say they work great. There are two things to mention, though. First, the positive. When using these, the noise-cancelling action works so well that I can listen to them at a very low volume which is more confortable and everything is crystal clear....much better than my older non-noise-cancelling set. Now for the bad...If you turn off the headphones (noise-cancelling function), they do not work at all. So, if you want a good set of headphones to use in differing environments, these may not be for you. If you think you will always use this function, then these are fine. But if your battery dies, then you have no headphones. If you want to listen but do not wish to turn on the noise-cancelling feature...then they will not work. These work so well than I cannot hear my phone ring at work which is not good. I wish I could
just turn off the noise-cancelling feature sometimes and use them as traditional headphones.