I've tossed this idea around many times myself. $635 is not bad at all. You can still buy them new at $1699, so $1k less is just fine. Look for a seller who has low useage/low shutter count, and a return policy. I'd pay $600-$900 for one depending on the condition, personally. Should the shutter go bad, no big deal b/c Canon will still replace the assembly, although it will cost you. I'd say go for it. I probably will in the future myself, just to explore the film-era again. I used to shoot film in the 90's and used Olympus equipment. I wish I had bought the Canon EOS-3 in 1999 though.