^^^ Who really knows the story on the china carbon frames but I don't doubt there's some copies or perhaps rejects leaked out the back of the legit factories.
Anyhow, I was an early adopter of the carbon frames in MTB with using a Kestrel CSX hardtail (not the first versions). Granted I was riding harder and physically better conditioned back then, but that frame took some serious hits. Chipped and all, was terrific.
So just last week I started a serious look into the carbon MTB FS frames by Santa Cruz. Will find the link on the tech section later but you should see them give the factory brutal and stress test videos. I'm convinced. BTW: Santa Cruz is late to the carbon frame market yet something must have made them go for it. As for the chinese produced frames... I just don't want anything to do with them or a company having them made there. To each their own.
http://www.pinkbike.com/video/243228/