I have some of their microservos. Out of a batch of 8, 2 were dead on arrival. The others work fine, and they are very cheap. I'd guess a big part of that cheapness is poor quality control. When they are built right, the servos are fine. But the failure rate, for me, was awfully high. I put them into models I don't care much about!

Don't know anything about their bigger servos, but do you really want to risk a jet on them? Up to you. I would burn them in with a servo cycler for a few hours before installing them, that's for sure.

Hope that helps a little bit, it's not a perfect answer.