Commuters: Which mirror?

Which mirror is best for a helmet or glasses mounted application? Are they fragile, or can I venture off road on my ride home from work on the cross bike?

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Bike Peddler Take-A-Look:
http://www.amazon.com/Bike-Peddler-Cycling-Eyeglass-Original/dp/B000C17M26

I’d think you can take it off-road.

Yup, that’s the one I’ve heard the best things about. Not sure about off road capabilities.

I had that one. Didn’t like it at all.

don’t know about glasses since I’m half-blind, can’t see a glasses-mounted mirror.

On Sheldon’s recommendation I have the Third Eye helmet mirror, it’s been fine. No problems riding singletrack on my way to work.