I have been using R1 Concepts C/D rotors for the last year and I luv them!
I'm on my second set of front rotors because Cool carbon brake pads ruined my first set within 2 months of installing them.
Now I using OEM brake pads and couldnt be happier!
OP, if you plan on buying from R1 Concepts, pay the extra cash and get the premium rotors. If you are serious about ordering, lemme know? I believe I still have a 5% or 10% coupon code for being a loyal customer. I'll hook ya up!
BTW, check my album for pics of rotors on my car.