Well if anyone cares Vette's with the Z51 package, new Gran Sports, Z06s, and Zr1s have holes in the rotors, even the uplevel Vettes with the Carbon brakes package. They are cast that way, and I've also seen them crack. Pretty sure Doc's SL600 he just got rid of had holes too.
I don't really care about this topic, but I'll just stir the pot. I wouldn't recommend cheap drilled rotors to somebody looking for a braking "upgrade", but if you buy the high quality parts it will work good.