The Take-A-Look mirrors are THE best! I've had numerous mirrors of various types over the past 25 years and the Take-A-Look is the most stable and has the best field-of-view. They do clip right on and off almost any glasses.

I also have a Mountain Mirrycle mounted on my recumbent (mirrors are pretty mandatory on recumbents because you can't look back easily) just in case I forget my Take-A-Look, but the Take-A-Look has a wider view, is much lighter, and is easier to look into (don't have to turn the eyes so far to see back). I think the person who said it was annoying in your peripheral vision is just a style-conscious poser! (Are your CAR mirrors annoying in your peripheral vision?)

I personally would not ride without a mirror.