I just put a pair of the pro's on my stinky. Love them so far, more than the mags that came stock. I didn't get the floating rotor...sticking with the V8's that I already have on there for now to see how it works out. Adjustment is amazing...so easy to get it "just right."
After 20 min of riding or so, I already noticed a difference in single finger power. Not huge, but I could see these making a difference on very long runs in tired hands. I also dig the look, although they do seem less bullet proof than the fully shrouded mechanicals on my old mag brakes. Hayes mentions laser etching for the graphics, but the ones I got are 80% pad printed, with etching just in a couple spots around the dials.
I found them at Univerals Cycles and used the >$300 "VIP15" 15% discount code...$306 for front and rear shipped. The code knocked off $54. Overall--very happy with the purchase. Can't wait for the snow to melt so I can take the bike up to Tahoe!