I've used an older quad lock for several years now, same one on my ST and I move it when I ride my VStrom. RAM changed the rubber grippers because on the older ones had a tendency to slip off the metal prongs (dropping your phone, etc.). Despite this flaw, and that I can pull the rubber tabs off the metal, I have never had a drop (or, any trouble at all) due to this kind of failure. They also sell a fat rubber band - a die cut piece of rubber that fits behind the X mount's arms and securely holds the phone in position. If you have one of the newer thousand dollar phones, it's very cheap insurance. Should you buy a used X mount, give the grippers a tug - if they come off, a small dab of construction adhesive or weatherstrip adhesive will secure them permanently.