Having ridden a 2010 M8 this year (and sold it) I can tell you that the Pclaw is NOT god's gift to tracks. That thing trenched like a beech and got walked all over by an XP any time the snow was soft. With a base it could hold it's own, but I sure wouldn't waste money on changing to one, unless my sled came with a 1" lug.
I have ridden both the HCR 90 duro and the std 80 duro Power Claw tracks in Polairs sleds... both were exceptional tracks... This is also the track of preference of Jack Struthers lately... Might have been the setup???