I think they are fine, however there are some who have their doubts. The problem is that you have a 3rd world country doing quality control on the product. So, the only REAL way to know is to test every freaking batch of product. I personally have done ttokkyo gear and been pleased.* (Note: the preceding statement is pure fiction and has no resemblance or likeness to reality because I would never ever, not in a billion years, ever do anything that would be illegal)
One thing, most say their sust is painful as all get-out.