I used to use handle bar mounted mirrors but gave up on them. They were constantly getting knocked around, they made leaning the bicycle up against something a bit more difficult (no kick stand). If possible get "a take a look" mirror that mounts to glasses or helmet, take sometime and learn how to adjust it and I think you will find it much better than a handle bar mounted mirror. Good luck with the mirror search, a good mirror is IMHO the best and most important safety device you can have.