Hey,
I bought a pretty much pristine Black Knight last year; it had a small nick on the left side of the cabinet that was maybe the size of my thumbnail, and a small (tip of a pencil sized) mark on the backglass which may or may not have come from me moving it 800-ish miles. I tried it out, and it seemed like a reasonable game. I hadn't played it when it was new; I don't think I was born, but for the price and condition, I couldn't really turn it down.
I had the game for about three months; there was one night that I can recall being into that game and enjoying it, but it just seemed fast with no substance to it whatsoever. I sold it to a fellow who had been looking for one for five years; he couldn't have been happier, and I was able to get a Pin*Bot. Good deal for everyone.
Luke