i bought the R1 concept set up last year after having a grinding problem with the brakes that came with the car...no idea if they were stock or not, but they weren't slotted or drilled rotors. ANYWAY... i have really liked the R1 rotors, no noise and very little dust. i think the pads need to be replaced though after a year and 3 months of having them. the rotors look good. I think what everyone is saying about the rotors and pads is a good way to go. I never had problems from the start of putting them on, but now it seems i need new pads.