For me, there seems to be 2 distinct types of Chinese carbon frame sellers / manufacturers. Those like Miracle bike that do lots of knock offs, and those like Iplay and Hong-fu that sell open mould frames - ie not a copy off another brand.
Personally, I probably trust the open mould frames more, but I've no real evidence for that, except for the fact that for many years I've followed the threads on MTBR and roadbikereview, and their are 1000s of happy customers out there. I also have a number of friends with them - and they haven't broken yet.
I guess I trust the counterfeit frames less, simply because of what they're doing, and feel they're probably less concerned about making a quality product.
I've owned bikes from Ribble, On One and Planet X. These UK brands sell their frames direct to the customer, after having sourced them from China. I don't see what we're doing, in buying direct from the chinese suppliers, as being much different to what these companies are doing. The trick id finding a good company to deal with.