From 1/20, when I got the sony vh110 bt headset, I've had zero problems. It hasn't hiccuped once and walking out of range - and getting 30', simply disconnects the headset. Walking back in range it reconnects no problem. No muffled complaints, static, etc.
Now I wish I would have gotten the more expensive version with noise canceling, because the biggest complaint I get now is that every sound is noticeable. Funny, considering the complaints I got when using the BlueAnt T1, Voyager Pro or JB Prime 2. I still hope that Apple fixes the problem as I'll then have a perfect headset for the car (the Voyager Pro) and the sony can stay at work.