Have tested the new MB HFP bluetooth puck (noted in above post) with my 8100 Pearl -
Works great, sound quality excellent
Phone book (not SIM) downloads to cars display
Remains active after engine off & key out - you have to manually disconnect from the phone menu to transfer the call to your handset, but this is seamless. Was funny first time I forget to do this and my fiancee's voice kept coming from the car as I walked up the road
Not tested if voicedial works yet