I've got several Century-imported bolt guns, and I have one of the Century-built Cetme rifles in .308. At that time, Century was somewhat known for poor workmanship, particularly on the Cetmes that they were turning out. I bought mine used at a local gun store, and the only thing that I knew about it was that it was a fraction the price of an H&K 91 which I wanted desperately.
After tinkering around with it for sometime, discovered that the bolt had been ground to achieve "proper" bolt gap, I ended up having to get a new bolt, locking piece, rollers, etc. After that, my bolt gap was still wrong, so I eventually sent it to a gunsmith that was familiar with the platform and had the barrel re-pressed. He also fixed a couple of other minor things with it.
That was many years ago, and my total investment in it is only around $600 (and I was lucky enough to get a box full of magazines when they were for sale for 99 cents apiece). Since the repairs, it has run flawlessly - the biggest problem is that I can't afford to feed it.
Having said all of that, I don't know anything about their AKs, only their history of suspect quality control. If you're after a good AK, you might have a look at whatever Saiga rifles are available. When I picked mine up, they were regarded as "true" Kalashnikovs because they were made in the Izhmash factory. I think that they are no longer imported that way, and that maybe the receiver (and maybe other parts) are made in the USA for compliance sake. I'm on my work computer right now and all gun sights are blocked, so I can't check.
Good luck with whatever you end up with and take care.