I have 7 of them (both Star Wars and Marvel), and I have to say that even though the sculpts themselves are amazing, I´m not really impressed with the quality of the casting.
There are severe moldlines, and on a few even places where the molds haven´t been properly aligned (--> the halves are "skewed").
This is on both the white metal and the resin parts.
That being said, none of the problems are insurmountable to fix, and I´m not saying "don´t buy them" (after all I bought a lot - even after seeing some of the casting problems), but be warned that you might get some that will require quite a lot of work before they look as good as they do on the pictures.