It depends on the quality of the material the rotor is made with. I've seen hundreds of circle track rotors glowing orange that are drilled and they endure pretty good. I will say usually you do get what you pay for, the cheap ones do crack very soon. I agree though ebay rotors are not usually made of good material ( Chinese) and not generally a good idea on the street.
I bought mine from here http://www.r1concepts.com/
Premium series drilled and slotted been fine for almost 5 years now.

Last edited by brads70; 09/26/14 03:29 PM.