I just purchased the Garmin c550 Street Pilot yesterday and I can not believe how user friendly this thig is. I dumped the I-Pod and can now incorporate all my MP3's into this unit. (does not support M4P's) The sound quality is amazing through my new Aria JM integrated helmet. My phone is Bluetooth compatable and it works great with the unit. I think the neatest thing about this design is no external antenna needed. I can just take the unit off the mount and use it in all of our vehicles. I did have to change the default voice (a womens voice) to a mans voice because I can't stand a women telling me how and where to drive. Other than that so far I rate this thing a 10!!!!!!!!