I agree, at this time the zumo has a lot of issues, so well have to wait and see a few months, we had the same trouble when the 550 was new. Bluesonic does not support A2DP, thats because Schuberth wanted to have stereo sound sent to two helmets, A2DP does not support that.
So far I have managed to connect the zumo 660 to Mototstation Audio in via a 3.5mm stereo cable, for music and nav commands, works fine, sound in both helmets.
Since I cant pair the Bluesonic as a headset to the 660 I have paired my iPhone 3G directly to the Bluesonic, works fine. Thats all Ive done so far, still no fm radio, need time to ride the bike to
Well Schuberth has confirmed that Bluesonic cant pair with zumo 660 and the Bluesonic Ive got has never been paired with a zumo 550 (as far as I know), so I don't think thats the problem.