I do have an audio quality issue, but only with one of my two phones. The iPhone is fine, but my Galaxy Nexus is scratchy and somewhat hard to hear. It got no better with the Android 4.1 update.
It's not so much a car issue as it is the phone, because my earpiece has a similar problem with the Galaxy. Perhaps 4.2 will fix that and enable MAP protocol finally.
2014 535d xdrive ED 4/28/14 Glacier silver, Ivory Interior-Soft Close Doors, Ash wood, Harmon Kardon, Cold Package, Driver Assistant and Driver Assistant Plus, Luxury Line, Lighting Package, Luxury Seating Package, Premium Package