I have a 9300, but I don't have my X5 yet -- I ordered it a few days ago. I did some research in order to decide whether or not to order bluetooth in the car, and I found someone in a forum (maybe this one, I don't remember which one) who said that the 9300 connected fine but was unable to transfer the address book.

Since I read that you can manually enter a voice command address book, I figured that is good enough for me. I wouldn't typically make a lot of outgoing calls while driving except to a few select people. The larger convenience of bluetooth would be to be able to answer incoming calls while driving.