Summary: .... because my wife and daughter kept taking mine! Very nice noise canceling headphones for the price. The noise canceling part is more than sufficient for airplanes. Reasonably comfortable, able to wear them for 3-4 hours in comfort (with glasses on). Sound quality is acceptable but not great. Certainly fine for watching movies on the airplane, but I wouldn't use them at home for general listening. I have about a normal sized head, and they *just* fit me.
Summary: I use these headphones to get work done in loud environments. They work great, there is some ambient noise but it is dramatically better with the head phones. They get uncomfortable after a few hours but I don't think I could wear any pair of headphones without it getting uncomfortable after that long, just need to let the ears "breath".
Summary: For the money difference in these verses Bose Quiet Comfort these stack up nicely. They don't turn off the outside world but they do tame the droning engine sounds that reverberate in your skull on a long flight.
Pros: Compact, Durable, Good Value, Great Sound, Lightweight