| I have got the PFM superbike conversion on my track bike. Narrow band fully floating discs, 6 pots calipers and a Brembo GP Master Cyl. I run Carbon Bendix pads.
I have had no problem with those and I am very happy with the power and the feel under braking. I had an issue with the bolts fixing the discs to the wheel not sinking in the carriers (unlike brembos) and getting in the way of the speedo drive and after a phone call, PFM sent me some button head bolts that would fit for free. The calipers are also very light which can only be good for unsprung weight.
On the other hand I did hear some bad comments on the discs from KJ and others so may be I was just lucky (or not fast enough to warp them).
Brembo set up is a top alternative but costs arms and legs and more.
AP set up seems to be really good as well but 50% more expensive than PFM.
Anyway, if you want to improve your braking on a budget, start by getting a Brembo GP Master Cyl (£175 from Tecmoto) + Banjo Pressure Switch for the lights (£20) + Fully floating cast iron discs from Brembo (about £200 second hand).
Doesn't look as cool but it is what racers use if they can't afford the full thing!!
Cheers
p  | 
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