I have heard bad things about the century guns. I have no personal experience with them though. I have heard good and bad things about the PTR91s. No personal experience with them either. I have never really heard anything negative about the HK91 however and I have no experience with them either. I have never heard anything bad about the DS arms FN-FAL and I have plenty of experience with one of those. It lives up to its reputation. That being said, the PTR91 looks pretty cool and feels really good but the DSA FN-FAL seems like the better gun for the money IMO.
Century uses gun monkey gunsmiths but the parts are solid if you have a talent to tweak that stuff.
That would describe me