I got mine from R1Concepts as well, went from OEM base rotors to cross-drilled and slotted
I don't track the car and for daily driver they are good, and they look fantastic on my car..
I actually loved them so much I got another set for my Lexus RX.. it's funny how no one notices I have them on Boxster.. but everyone sees them on Lexus
I gues family SUV with slotted rotors looks good
Sasha