I am very impressed with these headphones. I have used them on two flights, each lasting about 6 or 7 hours, and also on shorter flights. They do just what you would expect them to - significantly reduce the flight noise, and allow you to listen to your music. The noise cancellation feature does noticeably reduce the aircraft noise still further. You can allow outside sounds in temporarily by pressing a button on one headset. I can't imagine flying without them now - I felt so much more calm and relaxed with the aircraft noise reduced. The headphones are able to give a good reproduction of both treble and bass sounds. I can't comment on why someone else wrote that they have a problem with the bass sounds - it's fine as far as I'm concerned. There are adaptors supplied to fit into aircraft headphone sockets, but you can also use the headset with your own media player. The headphones, cable, and plugs fit neatly inside the supplied carrying case. Of course, the headphones don't have to be plugged into anything - I've also used them just by themselves, to benefit from the noise cancellation feature.