Slow Fools claws are pretty much useless. The reason is that in order to get a decent WSM with a slow claw, you need to speed bug. The slower claw becomes the off hand when you speed bug, and in the case of fools that defeats the point (the primary hand gives bonuses to kicks and WW with Fools, the offhand either doesn't or it's a very minor difference, tests have proved somewhat inconclusive). While a runewords base with a poor WSM isn't a problem, a fools is. You might be able to use it on a kicksin that uses BoS, besides that it's not good.