I use a glasses mounted mirror. I don't find myself being involuntarily drawn to look at it so wouldn't characterize it as being distracting. I position it up and to the left so it's largely out of my forward field of view. Of course it has the pros and cons that have already been enumerated. Among the pros that outweigh the cons as far as I'm concerned are low vibration, large true-to-size FOV, and scan by moving head. Plus, I don't dork up the bike with a mirror. I dork up myself instead.
