my friend did, after he crashed and destroyed the stock fork.
he seems to like it.
i haven't been able to really notice any major difference with it, but that doesnt really mean anything because when I ride his 59cm with extra-long seat post (he is 6'4" and about 5' of that are his legs) there are about a dozen other factors taking my attention away from how the fork feels.
Personally, I own a pista, and I've put my money into other upgrades. I find nothing wrong with the stock fork.