Beware of generalizations of Chinese products...
I manufacture products in Asia for a living. I assure you that the person who purchased those turbochargers on eBay knew how crappy the quality was when the order was placed. For a bit more money, he could have made them identical (or better) than the Garrett models. I'm not kidding.
The factories in Asia are every bit as technically advanced as the factories domestically (or in Europe). Unfortunately, most who source products over there are just buying based on price - not quality.
Wow... those really are bad replicas.