I've had these headphones for a couple weeks now, and I use them at work with my Samsung Blackjack. I have yet to have them die on me, although I use them for 6-8 hours straight every day. They are relatively comfortable (or at least, no more uncomfortable than any other pair of earbuds I've worn) with a decent sound (although the BT stack in WM5 devices causes some distortion in the higher frequencies). The ability to attach the individual ears together via magnets seems kind of gimmicky at first, but is actually a very convenient way to store them. The cord also stores very well and you have the option of charging the headset either with a USB cord or through an A/C adapter. All in all, the product works as advertised, has a good price, excellent battery life, above average sound quality, good range, and a cool form factor.