R1 Concept rotors for KH setup

I am getting new rotors soon and am curious if anyone has used the various rotors available from R1 Concepts. They offer std. rotors, slotted, and vented rotors. Any word on their quality and longevity? Again, these are for the Kelsey Hayes 4-piston setup....but input from the 73' and newer brakes will be helpful too.

Thanks