I had one, I had to do some work on the inside of the receiver so it would function ok. (stamped receiver century gun) It was mostly a matter of cleaning up the mess that was not cleaned out when it was assembled by century. luckily the bolt was not ground, ( it is a hack way to get it to headspace) and some burrs in the inside. once I did that it ran fine. google for the issues they can have and check to make sure the example you are looking at does not have them.
If you are not willing to do a little work on it then pass. (any century Arms gun has that possibility btw.) It is a heavy recoiling rifle for a semi auto. (m1a is less felt recoil for example) I would buy one if the price was right but I am an advanced hobbyist gunsmith.