I should start by saying this is my first Bluetooth device, so I was pleased at how easily this paired to my phone (Samsung Galaxy S -- another reviewer complained that Samsung didn't allow third-party device pairing, which obviously is no longer true) following the instruction manual (whose usefulness sadly sort of ends there).

I should also say I didn't pay full retail but rather bought through a Hong Kong eBay seller -- waited an eternity for shipping but got a real bargain, especially considering the device is far from perfect and not exactly worth full price.

First and foremost, battery life.  The description promises 8 hours?  After two full charging cycles, I'm lucky to squeeze 3-1/2 to 4 out of it.  Maybe that will improve over time, but doubling?  I'm skeptical.  Of course, it seems to give another hour or more of use after the low battery starts alarming, the problem is that's with an audible chime every 30 seconds or so that interrupts your music and is impossible to ignore.  There's nothing in the manual about disabling this so I doubt it's possible.

Second, the play/pause and rewind buttons are a bit hit-or-miss.  Not a dealbreaker, but I would have felt a little shafted if I had paid full retail.

I was a tad disappointed in the range.  I had hoped to use this while working nights at a vet hospital, but concrete walls proved too great an obstacle.  Works well with the phone in the room with me though.

Those are my only complaints really.  The volume is great, even a little too loud at times.  The hands-free works well and my callers say I sound fine.  I like keeping this tucked under my shirt while biking and eliminating the obtrusive headphone wire extending all the way to my handlebars, and I can correctly hit the buttons through my shirt about 90% of the time thanks to the ridged edges.  I especially love that I set this up with my Tasker app so just connecting the BT automatically launches my bike computer app, turns on GPS, maximizes my screen brightness and media volume, and disables screen timeout*.

In short, a cool little toy but don't settle for full retail price.

2-week update:  It seems like the battery life is getting worse rather than better.  Occasionally will get a "bum connection" where music stutters or puts weird choppy cuts in that screw up the beat, fixed by unpairing and re-pairing.  With these shortcomings, I think they really have some stones asking such a high retail price for this thing.

*This might be more of an endorsement for Tasker.
I should start by saying this is my first Bluetooth device, so I was pleased at how easily this paired to my phone (Samsung Galaxy S -- another reviewer complained that Samsung didn't allow third-party device pairing, which obviously is no longer true) following the instruction manual (whose usefulness sadly sort of ends there). I should also say I didn't pay full retail but rather bought through a Hong Kong eBay seller -- waited an eternity for shipping but got a real bargain, especially considering the device is far from perfect and not exactly worth full price. First and foremost, battery life. The description promises 8 hours? After two full charging cycles, I'm lucky to squeeze 3-1/2 to 4 out of it. Maybe that will improve over time, but doubling? I'm skeptical. Of course, it seems to give another hour or more of use after the low battery starts alarming, the problem is that's with an audible chime every 30 seconds or so that interrupts your music and is impossible to ignore. There's nothing in the manual about disabling this so I doubt it's possible. Second, the play/pause and rewind buttons are a bit hit-or-miss. Not a dealbreaker, but I would have felt a little shafted if I had paid full retail. I was a tad disappointed in the range. I had hoped to use this while working nights at a vet hospital, but concrete walls proved too great an obstacle. Works well with the phone in the room with me though. Those are my only complaints really. The volume is great, even a little too loud at times. The hands-free works well and my callers say I sound fine. I like keeping this tucked under my shirt while biking and eliminating the obtrusive headphone wire extending all the way to my handlebars, and I can correctly hit the buttons through my shirt about 90% of the time thanks to the ridged edges. I especially love that I set this up with my Tasker app so just connecting the BT automatically launches my bike computer app, turns on GPS, maximizes my screen brightness and media volume, and disables screen timeout*. In short, a cool little toy but don't settle for full retail price. 2-week update:  It seems like the battery life is getting worse rather than better. Occasionally will get a "bum connection" where music stutters or puts weird choppy cuts in that screw up the beat, fixed by unpairing and re-pairing. With these shortcomings, I think they really have some stones asking such a high retail price for this thing. *This might be more of an endorsement for Tasker.