slotted and or drilled rotors

I used to sell a 13 inch conversion kits for Mopar cars that used an OEM Mercedes rotor. Those rotors had holes in them right off the factory floor. Porsche rotors also have holes in them. So if it is good enough for Mercedes and Porsche engineers then it is good enough for me. I'm pretty sure that the factory boys test the snot out of these parts so if the holes created cracks they wouldn't put these things on the high dollar cars.