I've been riding with the Garmin Street Pilot c330 GPS unit mounted on my bike with the RAM mount for over four months now and it's worked flawlessly. I've had no problems from the vibration, but then again there doesn't seem to be very much vibration to speak of with the mounting system.
Viewing the screen in the sunshine is a bit compromised, but I've found that I've gotten used to it and can see it well enough to suit my purposes. If you play around with the angle a bit you can position the unit so that the worst of the glare is eliminated.
What I really like about the unit is that when it is set on the 3D map mode the map is so accurate I can actually judge how severe an upcoming curve is going to be from glancing at the map. This helps me anticipate a particularly sharp curve and prepare accordingly.
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