Quoted from robbiedoo:
I've purchased from him - as long as you know going in that he's a business, and some (many) his machines are in players condition, then you're fine.
Bob's actually a really nice guy, and if you hate what you end up with he'll let you come back and swap for something else.
As long as you're educated about what to expect & what you're getting, and you can deal with paying more because he's a business and not a hobbyist, I would say you're fine dealing with him (which seems to be the general consensus!)
Bob is a really nice guy, I just wish he wouldn't misrepresent the quality of his machines in ads and on the phone. I don't know if he understands much of what he wants to sell at high end prices is low end player quality or not, but if he doesn't he should educate himself, and if he does he should just tell it like it is (and price it accordingly).