I have had a Garmin ZUMO 350LM for 4 years now that I bought on Amazon a refurbished one, the buttons are large and work with gloves, it works great most of the time, every now and then it will get confused when they have redone the ramps on the Interstates a b c exits and not updated it in the map updates, but I wouldn't go on a trip without it! I have it mounted on the right side of the handle bar and powered through the battery.
I picked up a cheap one off a friend. But of course as soon as i bought that from him, I saw the new Zumo XT from Garmin. It looks pretty awesome. guess Ill just have to start saving again, or wait for a used one!