Better tell Ferrari, porsche, Lamborghini etc that they're fools for using cross drilled and slotted rotors.
I've always been told that the reason DBA/RDA/insert other cheap rotor brand, cross drilled rotors crack is because they make the rotor and then drill into it or something, which obviously makes it weaker....I think Brembo etc make them in a different way so that the holes don't weaken the rotor...