Blackmagic - to be clear, the Cohaire/Vector guns have zero POF parts. 95% of parts are made by Special Weapons. The receiver is made by Cohaire, a company owned by the wife of Todd B., who owns Special Weapons.
As far as POF - we should be so lucky as to be able to get POF parts kits. They generally have the reputation for being of high quality (although not the equal of original HK parts). The problem is that POF hasn't had any parts kits for building of HK94 clones for about a year now. And yes, you can get a high quality clone if you use POF parts, Special Weapons receiver and a good builder (like Jayson at IGF).
Silesius - It's true I have had some problems with my MP5/10 clone and I do think I had the right to expect better from a brand new $1500 gun. However, Vector and Special Weapons/Cohaire seem to be making a good faith effort to put things right.
Also, from the posts I've seen, the .40 S&W versions of these guns do seem to be having less reliability problems. For most people they seem to be working right out of the box. 10mm and .357 versions seem to have been harder to build. (In fact, Cohaire has announced that they've stopped making 10mm and 357 versions and will only be offering 40's going forward.
At least I'll have a pretty rare gun (sounds like less than 100 made).