I am running the R1 Concepts pads and drilled/slotted rotors. Quite honestly, I am not happy with my brake situation at the moment. I find that I have to stand on the brake pedal sometimes to get my VX stopped in a hurry. With my stock rotors and pads I could stop on a dime. However, my problem is, I don't know if it is the pads or the rotors that suck (or both). I am probably going to replace my R1 pads with some stock pads and see if it makes a difference. If not, then I will do away with the R1 rotors and try something else....
That said, Biju has had good results with his R1s, but I don't think he has R1 pads, and I know he also has better brake lines installed as well. Hopefully he will chime in...
Bart