i've got a few of the clipless hingepins they seem to be okay generally, but the hingepin holders (toe blocks) suck (there is a multiple piece rear one I have that sucks) and i've also heard that all the clutch parts including bells and springs are all junk and of poor quality.
Personally i'd just give it a miss, chances are the stock parts on the K3 are better. Jesus guys, you buy Kanai editions so you DONT have to buy all these upgrades!
-uDi