Comp lifter problems?

They had problems about a year and a half to 2 yrs. ago but I think they got it resolved. They told me the factory here in the states they got their lifters from went on strike and they had to get lifters from China for a short time. That's what all the problems was about. I got 2 bad sets but they were good about warranty'ing them. I've known other people since then that haven't had problems with them.