I'm in to try the BT retrofit in an e90 without assist or navigation.
My parts guy at BMW No. Scottsdale has some info for me so I'll see if it jives with the bimmernav.com stuff.
I really want the factory integration. The other day I had an e91 loaner and I paired my Motorolo e815 to it and it worked as well as my old e61 used to work.
For the record, I have an 07 MINI Cooper S with BT and navigation and the audio is terrible. Absolutely no one can understand me when I'm in my car and I don't think it's just because the car is noisier inside. I'll need to take it back to MINI service.