I've got a KFL+ and a Russian 91%, and this Black edition seems to combine the missing features from both. I may have to pick one up if the quality is good.
It has irritated me that the R91% has the old deficient fill screw (no o-ring), but has the adjustable centre pin, where the KFL+ is the opposite. Though I will say, my Russian has a problem with the adjustable centre pin (or possibly the insulator) - the deck moves really easily when trying to make adjustments, and there's a serious chance of shorting. I've also noticed occasional leaking depending on adjustment of the pin.
Can anyone comment on centre pin issues with this clone?