Ditto, the Mirrycle. Both my hybrids wear 'em. Great mirrors, excellent values, tough and just about unbreakable. I've tried to break mine crashing on the mirror side three times. No dice. The arms just pivot out of the way. Just a couple of minor scuffs on the stem.

I don't have a mirror on my road bike and rely on a helmet mounted Take-A-Look mirror. It's good too, but took a lot of practice to get used to. I hated the thing for weeks but finally forced myself to get the hang of it. Now I like it. But handlebar mounted mirrors were easier to get accustomed to.