So I've only had the V1 for a short time but on one call I just tried to answer it answered but I had no audio. I hung up they called back and then it worked that time. Anyway on their website it appears there is a firmware update for the headset that is supposed to fix this.
Guess they are going to provide updates for this thing.
BlueAnt Wireless North America - V1 Voice Control Headset Product Manual page