I read an interesting article two or three days ago about motorcycles and brakes. The main point was that a very few riders (maybe 1 to 3 percent)use thier factory brakes even close to the potential stopping power built-in. Most people can improve thier stopping distance significantly more by practicing hard braking than changing brakes.
I know someone here will disagree, but I can get the rear wheel off the ground with my factory brakes. I don't know how much faster you can stop then that!! Yes, the Brembo's will cool faster and hold longer. But lets face it, how often do you ride like a pro racer, braking hard every few seconds, where the difference is apparent? On public streets, riding under normal conditions I see no benifit for the upgrade especially for 95% of the riders out there.