I use a Garmin Zumo 390 LM. First i tried with the RAM mount which was given with the Zumo, but due to vibration it was coming down after a while and was making me crazy. Then i bought the Touratech mount , which solved that issue however i am still not satisfied because the GPS bar is part of the windshield unit and it is not coming from the main body frame of the bike (unlike GS) and that creates a free-vibration with the weight of the GPS device.