Summary: I got these to replace my Bose over-the-ear QC (15?) headphones since they are bulky to travel with.These new QC20i are amazing! Very easy to carry around, and they sound great too. You need to keep them charged, but thats not hard to do. They even allow passive mode if you run out of battery. Best I've used. Pretty comfortable for in-ear phones too.
Pros: Comfortable, Compact, Good Bass, Great Sound, Lightweight
Summary: I have only tried them a few times so far, but they are amazing. I replaced my current set of full size QC 2 headphones with these and I think the sound is just as good if not better at a mere fraction of the size.
Pros: Comfortable, Compact, Durable, Good Bass, Good Value, Great Sound, Lightweight
Summary: These are good hybrid-type headphones. They do not cancel noise as well as the big over-ear headphones, but they are a lot better than the non-noise canceling version of these headphones. If you don't want the bulk of the big ones and don't need to completely block the outside noises, these will do just fine. They are a bit bulkier than the non-noise canceling headphones because of the battery pack; but it is small and light so it is generally not too obtrusive.
Pros: Comfortable, Compact, Great Sound, Lightweight
Summary: Took me exactly 1 hour to break these. Totally my fault because I snaggged the wire on a cabinet handle. Still works and got things worked out with purchase protection. Still seemed to methat it took very little to break these. Sound is great and noise cancelling really works well.