BMW has been known for its BT issues for long time, so it shouldn't come to you as a surprise.
I would probably get a Hero in a few days from now, and have two BMW BT's where I can try. Will let you know.
Not there yet.....
HD2, but still missing my faithful Trinity, BT Samsung WEP200, Parrot, Jabra AND BMW BT Carkits, iLUV 903, Motorola S9.
Ex: Sony P800, Qtek 2020, Typhoon, JAM, Universal, S200, TyTn, Touch, HD, and many PDA's, and tablets. Ex iphones 1&4 and Ipad too. Ex SGN-I and II, and SG-III for a while... forced back to a 64 GB SG-III.