Well, I guess knock-offs are found with most of the popular toys... and since China has an exploding economy, it is very conceiveable that knock-offs from other chinese manufacturers will pop up on the market, so fighting them will be a humungous undertaking

...
I think if one is to choose quality he will not turn to those chinese toys, but will stick to the original. Perhaps those sets are only interesting as a curiosity in certain collections.
At least that is why I have a Schenk set in my collection: I think of it as a curiosity and I think Schenk has reached some sort of cult status (at least that's what I feel about it) because it was one of the first copies that was really similar to Playmobil.