I have the Zumo 665, which is almost identical, with XM radio. Its a great unit. Easy to use, rugged, waterproof and easy to see almost all of the time. I do disagree with davelau above. I tried to use mine with my Scala Rider G4, via bluetooth, but that was a non-starter. All I would get is a crackle. I hooked mine into the audio system and it all works great. I am trying to work out the wiring so that I can get stereo for the XM. That one may take some time. All in all, its an expensive outlay, but a great GPS.