Count me as one of the mirror fans.

I tried a glasses mounted mirror about 30 yrs ago. But I found it distracting. I also seemed to have a hard time interpreting what I saw when I was actually trying to look in it.

But I'm very uncomfortable riding without a handlebar mirror. I use two, in fact.

Whether in a car or on a bike, I'm fond of thinking that NO ONE comes up on me without my knowing it. And it's very nearly true.