You'll love it, the 660 is a cracking tool! I've got mine connected to my iphone and my sena headset, really easy pair up. The Garmin has got 3 e-books saved so I can listen to them, play music, radio, stroe/look at photos, MP3 files. You can plan and download routes on your laptop with the Garmin app, but I can't work it!
I bought a car mount with mine so I can use it all the time, it switches from one to the other, I was told you get more vocal directions in Bike mode, not sure if thats true though?