Many people seem to worry about buying used equipment, but I don't understand why. I buy almost all of my gear used, and often in not-so-good condition, and I've never had a piece of good equipment die on me. Additionally, I tend to treat my gear pretty harshly and still after years have never had anything break. I've had stuff dent, crack, etc. but never quit taking pictures- and that's what I buy it for.
I have, on the other hand, had a brand new Hartblei-modified Kiev die after two rolls of film for no reason. I had another one that worked fine for years.
What I'm trying to say is that I believe a brand new Kiev is far more hit and miss than used gear from any better manufacturer. With Kiev, it may just up and quit working whenever it feels like it. With better gear, if it works when you get it, it's probably going to keep working.