I've only had 2000 bike that had the 4 piston calipers. I've always thought the brakes were excellent. Most of mine had triples disks, the Deuce had one up front. My only complaint was the brake squeal. Lyndall is all I use now and floating rotors on both bikes.
I've often wondered at the big cost to improve brakes. Can they get that much better?
I can't imagine that there could/would be that much more in braking performance over the stock on the '4'
HOWEVER, I'm not saying that there isn't more braking performance ..... I'm like you, I think, and am not sure that any such improvement in performance would warrant the cost (at least on the '4').
I've NEVER felt that I needed more braking than what I have on the '4'
It's always provided all the braking that I've needed/wanted.
I'm sure that's because of the dual brakes up front on the '4'
Like I said, the only reason that I'd change mine out is for the 'chrome' PM calipers .......... I think they'd look 'real kool' on the bike
HOWEVER, I have a few 'other' things that I'm gonna put on before changing out the calipers ......... ahhhhh, the list is so much longer than my checkbook, whuts up with that