What is it with the report button? Must be broken so l4by decided to post instead.
Anyway, this is the whole point of the review section, so that rather than posting a new thread in tech or general etc, someone can ask in here in the threads that are already there.
The differences between the clones and the originals are in this case minimal, mostly just slightly rougher cast parts and paint, and in this case a pretty poor air seal so they stuck in a stronger spring to compensate.