I worked at a shop locally during the last half of the ban during the heyday of clones, and was the go-to guy in fixing them and their mistakes.
I wouldn't buy a Cetme. Failure rate was just too high, and inability to use accessories etc plus just general clunkerdom ruled it out. Problems were often multi-systemic - you've get trigger packs/shelf issues plus bolt gap plus alignment problems all in one rifle, and diagnosing and fixing was a nightmare at best.
The FALs, I never saw one I couldn't fix with $20 worth of parts or less and a half hour of time. Most often it was bad gas FSB/regulator/tube issues. I bought and sold a bunch personally, and still own several plus my beloved unissued STG-58 kit builds.
Would I pay $650 or whatever market is on Century guns now? Yes, if I didn't already own several.
Don't expect wonders out of Century FALs, in that the compliance buttstock/furniture is horrid. Don't expect great fit/finish. Expect to tweak the gas to fit your ammo more than, say, a new DSA. For the money, you'll likely get a working rack-grade equivalent rifle.