I listen to Audible books through the Bluetooth connection to the Model S. I'm not sure where the Bluetooth receiver is in the car, but I have significant issues with the Bluetooth connection dropping and reconnecting. I have also seen strange "gaps" in XM and HD Radio connections - that do not seem to be related to where I am driving (.i.e. no obstructions), but that may be an unrelated problem. Hopefully this is a software/firmware issue - where the audio process as a low priority is getting bumped and can be corrected. Anyone else seeing similar performance when playing music through a bluetooth connection? On the bright side - people talking to me when using a phone connection say the system sounds excellent.