I have a convex bar end mirror on the left side. With the center of the stock clip-ons rubber mounted I kept the bar end mirror holder from touching the outside of the bar with a small washer, it seems to minimize vibration. Or maybe it doesn't, I did not try it without, with the washer just made more sense to me. Visibility is just ok, you can tell something is back behind you. The biggest thing for me with any bar end mirror is looking away from the road to possibly see what is behind me.