Not a fan of the two piece arm and head unit design. The bottom two screws that hold the arm to the clamp have a tendency to come loose. For this price I shouldnt have to worry about losing an expensive bike computer and a light. Tightening the screws holds for a few hours of riding then the entire head unit will begin to come lose and rattle again. I may as well go back to my old and trusted BarFly 2.0. Very disappointed.