I have a user M2 that I don't...well, use much anymore. It's got some wear and tear, missing a small piece of the vulcanite, rubbing at the top and a couple dings here and there. It used to belong to a university. The worst thing about it, I think, is the patched shutter, but honestly, it's never caused me any grief, ever. Rangefinder is good and accurate, everything is clean, and the camera works like a charm.
I paid about $500 for it. I'd be happy to see $450 if I were to let it go. =)
Good luck with your GAS. It's the reason I own it.