The Century Vz-58 is actually probably among the best products Century has ever come out with. Check out the user/buyer reviews on J&G, they're all positive. I bought one of them myself, it's 100% reliable, it's very accurate, lightweight, and just an all-around good buy. I will likely buy another. J&G sells them for a meager $429, and a local FFL here has them for $450 each, the D-Technik guns are not just $150 more, they seem to be $300-$400 more, and it seems like all that extra money only buys you a better finish. For me a pretty finish would make me feel like I have to more "gentle" with rifle, and who needs that?
I know Century has a spotty reputation, and I've had a couple of Century-assembled firearms that I'd give a thumbs down to (namely the Golani sporter, and "Bulgarian" NDS-2). But their Vz-58 clone seems to leave me with very little to complain about. If I were to come up with any complaints, it would be about the the Vz-58 design itself, rather than Century's job of assembling it.
Additionally they have a couple of advantages over the more expensive Vz58's, the Century guns have a long enough barrel to not require any gunsmithing to replace muzzle brakes, and they're threaded, and the Century guns also have bayonet lugs. The d-technik guns have a permanently affixed barrel extension that must be removed if you're to add a muzzle brake, and any muzzle brake you attach must be affixed permanently. They don't have bayonet lugs.
They're kinda ugly, but they work, and work well. Take it from someone that actually has one of these things, and shoots it, rather than people who simply infer it's bad based on it being from CAI.