I purchase one of these almost a year ago , product have be excellent . I have use the mount on my dirt bike in very rough terrain go very fast , no problem . I have have this mount on my mountain bike in Moab , UT no problem . I ride my dirt bike one to three time a week over rough trail with this mount and no problem . when I go to a wma on my mountain bike and ride for a whole weekend I never have a problem . I think the people where the GPS fall out after two small bump and such do not install the mount correctly . I never write review unless a product real impress I and this one do . I have purchase two so I do not have to keep switching hardware between my dirt bike and mountain bike . this be a great product .