Thanks for the comment, Spyder!
I think what you'd notice about the Brembo's is controlled and progressively stronger braking relative to lever pressure. I can haul that Road Glide down in no time at all without being anywhere close to brake lock up (a definite plus). Throughout my not-so-illustrious motorcycle endeavors, I've had the occassion to own a few Ducati's (Monster, 916, 996) and an Aprilia RSV-R; all V-Twins, mind you. That's where I got used to great brakes and learning how best to use them. It isn't that the newer 4-piston brakes from H-D are bad, it's just that there are other brake systems that are much better. As someone else has commented in this thread, I, too, very much enjoy a "spirited" ride both in a straight line and in the twisties and find that good brakes are a necessity.
I had a '99 Road King Classic with the old single puck calipers on the front, and better sense told that a 700+ lb motorcycle simply needed better brakes. On it I put a set of PM 4-piston calipers (with 6-piston calipers you should really think about a new master cylinder: bigger bore, more fluid) and H-D's floating rotors. It was a marked improvement over the stock H-D setup, but I still feel the Brembo's are much better. Plus, the tech that installed the Brembo's said they were a snap to install.
Hope this helps.
LT...