Slotted rotors do run cooler, But Brembo brakes and rotors run coller for the simple fact that you have more surface area and mass to the rotors on Brambos. Thermodynamics comes in to play and transference of heat is not as rapid and the rotors will stay cooler. If it was me, I would focus on driving habbits and maybe purchase lifetime warranty brakes and rotors from your local autoparts store. You will be out your time but not money when you have to take them back every 15 to 20K miles.