I have a Century CETME. Yes, I had to fix a couple of things, but now love the darn thing. Unground bolt well within spec on mine.
My advice would be to have a gunsmith check out the rifle, if that's possible. If he says its good, get it.
If a 'smith can't look at it, read what you can and check it out yourself. If the bolt gap is good, and its assembled straight, it an be a fine rifle at a great price.