I found a thread from last year in which the principals from UUC and Bimmerworld debate their respective brake offerings.
Bimmerworld: While your kits are quite economical, the BMW M rotors in your kit aren’t real racing parts. Besides “M” is for “marketing” not “motorsports”.
UUC: Your StopTech kits are Brembo-wannabe, over-priced Taiwanese junk.
Both: Performance Friction are the gods of braking. All hail Performance Friction.
Update: More on the PFC kit, including photographic brake pr0n downthread.
Yep, those are the good ones. I’m using those rotors in stock size. I don’t know if they are better then the Euro-floating rotors, but they sure do look cooler.