Rule of Thumb: Century arms is a gamble at best. Some of their arms are okay to good, but their AK's are especially infamous for being bad.
Rule of Your Other Thumb: Don't but it unless you get to pick up, handle, and examine it to your desire. Make sure that the gun you buy is the one that checks out.
Rule of Your Friend's Thumb: Cheapo AK's costing less than $350 are cheapo for a reason.
Rule of Your Friend's Other Thumb: AK's are pretty hard to mess up.
I never had issues with underfolders because I let myself adapt to the peculiarities of the variant rather than trying to use it like a fixed wooden stock AK, and I like the traditional type AK stock. It fits me really well. An underfolder might be troublesome with fully automatic fire, but some anything you can put out with a civilian semiautomatic weapon, it's not going to make a different.