content: These are very comfortable, small and light, and they block the ambient noise very well. There are a couple of major problems however. One is that the chord is microphonic. It transmits a loud scraping sound to the earpieces when it rubs on your face or clothing. The other is the response. The only other earphones I have to compare it against are the Ultimate Ears Super.fi 3, (a.k.a. Altec Lansing UHP336). The Zen suffers very badly by comparison. It has an uneven frequency response with a bump in the mid treble range around 3kHz to 5kHz that makes it sound shouty. Another nit is that there is no room in the supplied carrying case for the airplane connection adapter.