if you can find a pair of hfx-mags then get those over the hfx-nines. less problems...
if you can't find them for cheap though, the nines should be fine with a few little modifications - first of which would be to loc-tite the adjustment screws for the levers so they don't back out on you, causing your brakes to feel really spongy. second would be to put a couple strips of duct tape over the little plastic plug on the master cylinder so that it doesn't come popping out during a run, spilling your brake fluid everywhere. these are the couple of things i've done to my nines and they work just fine.