Bose Quiet Comfort 15

Pros: Sound canceling is unrivaled
Extremely comfortable
Decent sound

Cons: Better sound can be found for less money
Relies on a battery to function

Summary: These headphones are amazing if you value sound canceling above all else. These are so unbelievably comfortable, and the quiet that you can achieve when flying justifies the price tag right there. My only real gripe is that the sound is not necessarily the best out there. Don't get me wrong, it's more than passable, just as superb as they could be. If you're an audiophile, go for Grados, Senns, or even B&W. Otherwise, bask in the silence.