ive got R32 gtst front brakes on my r31 with the rda slotted rotors and bendix ultimate pads (average). been on for bout year and a half now, pads are about 40% and the rotors are lipped (only slightly though definately machinable) this is mainly street driving. so yeah the rotors arent the longest lasting rotors there are.
btw did you get prices on R33 na rotors? pretty keen..