There are two types of snap in adapter. One is a simple alternative to the USB cable; the other is a "media adapter", which offers much greater integration of the phone and Pro Nav screen...but really, not much more than you already have with the full BT capability (maybe video, and antenna signal strength). Obviously, it keeps your phone nice and tidy, and charged.
I keep tossing up, but it's expensive in Australia (or even purchased from an o/s site) for not much benefit, IMO. Oh, and the BMW voice system is not all that good with Australian accents
