I drive a Ford Fusion Hybrid and my BT works great with the Sync system. Unfortunately, after being on the BT for a long period of time thru my car, my phone has issues, twice. First time, when am finished using the BT thru my car, my handset wouldn't work (the person can't hear me). I had to get another Razr MAXX. The second time was, same situation, after talking on the BT thru my car, this time, I can't get the "new" handset out of "stand by" mode, I had to do a hard reset but after that, it seems fine....as long as I don't use the BT thru my car for a long period of time. IDK, still experimenting.
I do hope they get the update soon and correct this problem or else am stuck with this phone for the next 24 months, lol...that would suck!