So I've been using this for several months now. The maps are fairly accurate, especially with the mapshare updates.
Contrast is good about 22 out of 24 hours... those real low in the sky sun times make it hard to read but with the bluetooth talking to me it doesn't really matter.
Bluetooth is great, the sound is good even with my loud pipes while cruising at 70+mph.
The phone feature works well at all but the highest of speeds from inside my full face helmet.
No music like the Zumo though.
The one thing that is a negative is that it is quirky. Sometimes it just doesn't want to stay turned off. It seems that any time I hook it to my laptop to get updates or do ride planning, it takes a few cycles before it will go back to the normal on/off status. It's more annoying than anythng since it's hard wired to the bike and always has power.
If the price is close, I say go for the Zumo 550. I really find the directions in the helmet to be invaluable.
I got mine for $475 shipped and for that, it can't be beat. So far it has been in the rain with zero issues.
My favorite screen is the trip statistics and often just ride with that showing.
