I really don't know. The 660 certainly has more road features (lane selection etc). I've only seen one in anger once, at the Lakes meet where I was trying to figure out how to work it to set up waypoints. It's very similar to the 550 but the icons are different and some things are located in diffent places.

I'm just thinking aloud really, there must be a reason adventure bikers are sticking with the 550 over the 660. Or is it because BMW and Honda re-badge the 550/500 as thier own ?

__________________
>-------<

Never underestimate the power of stupid people in large groups.