I like that there are two sets of 1219.2 mm/4-foot, detachable braided cables included: a black audio cable for kick-back listening and a beautiful blue cable with integrated mic and remote control for my iPhone. Both the remote control functionality and microphone are supported by most of the iOS devices--as long as they are 3rd generation or later.

I've been using the UE 900s on my subway rides where the 26dB of ambient noise isolation comes in handy. Taking the time to make sure you're using the right sized tip for a good seal in your ear canal ensures isolation as well as proper bass response.

I found the UE 900s most useful with my iPhone 4S. They have a warm sound that makes even the tinniest MP3s sound thick and rich. There is good and plenty of bass reproduction and they go louder than loud (impedance is 30-ohms) plus they don't 'leak' sound if you like your music super loud but nobody around you does.