I was personally wondering myself.
I would not use the BOV or the AFPR included with the kits. But this is my thinking, and why I want to try to use an ebay turbo kit....
If it is total crap, ok.... you have 800 bucks invested into it. The manifold quality does look decent, everything is braced nicely. The turbos do work good, I had an ebay turbo on a previous car and it was nothing but awesome.
As always, turbo kits are never permanent. If you use it just for a small while, and upgrade everything around it, its not a big deal. Later, add better manifolds, turbos, FMIC........ This would be a great basis for a quick car, especially for the price you are paying for the kit.