My friend that I ride with convinced me I need a mirror. I bought "the multi mirror" by blackburn, It can fit mtb or road, i ride road. I agree that it vibrates and I found myself constantly re-adjusting and trying to readjust while riding wasn't my cup o' tea. My DH is going to see if he can tighten it somehow so it would be less of a nuisance to me. I did like the idea of being able to see what was behind me. I agree with Kathi about having the mirror, as I had some of the same issues she did, and I only used it one day. I might look into Snappypx's mirror. That looks more discreet and less vibrations..but I will give my mirror one more try after some readjustments. Good luck.