They are great rifles! just with the current circumstances, the prices are a little inflated (see them mostly in the 3-500 range), but you can still find deals, i got one for $100 2 months ago, and my dad got one fore $150 the next week at a show. We looked for about 3 months and waited on a price we liked.... some may say that might not be a wise decision given the chance they could be banned again, but i'll leave that up to you.
I think they are great shooters, i like them much better than AK's.
As mentioned above check bores, esp on the non-chrome lined Yugo's, and check gas tubes (esp on Yugo's) it's a piece of cake to pop the gas tube off and have a look-see. Personally i'd only worry about mechanical state, and the exterior condition of the metal cause i HATE the factory stocks on the things. but that's just my preference.
good luck! They are sweet guns!