I tried a pair of Nissin 3-pots off a Kawasaki 1200... they were used, and I had to clean them out.. but they began to give me some problems on a long trip... somehow my rotor started getting more and more warped, giving me pulsation, until it was very bad and I had to point it home. It COULD WELL HAVE BEEN that I had damaged (bent) the rotor when changing the tire.. so i can't say for certain that it was the calipers that screwed me..
But I went back to the standard 4-pots again... put some fresh Vesrah pads in... cleaned out the old fluid... and you know what? These brakes work as well as any...(stainless lines and Wave rotors)... so I think that those three-piston calipers are ..not really worth the effort... although I guess they LOOK cool to your buddies at Bike Night
Black '98 B12S, JE 1216cc bore kit, light port work, Yosh RS3, Ivan jetting, drag bars, Corbin Gunfighter, Progressive shock, Racetech front end, stainless lines, Wave rotors, six-piston calipers, polished wheels, fender eliminator, bar-end mirrors, smoked shield, NEP throttle lock...110,000 miles as of late 2014.. two complete tear-downs. Fresh as a Daisy.