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I've had the Delco's for nearly two years. I painted the hubs, but still wish I had gotten them zinc plated to keep them from rusting. Also, I've just recently started to notice a pulsating in the brake pedal...feels like a slightly warped rotor. Running the GMPP ceramic pads with them, and all street use.
I have the gmpp drilled & slotted rotors. I would get stop techs. My rotors have tiny cracks around some of the holes. I dont think thats a good thing. They are 2 years old. You get what you pay for. Hope this helps you make your decision .
That's the downside to drilled rotors and why most suppliers state they are not for 'off road', or track use. They look cool but that's all you're paying extra for really. I'm not putting anything, especially a safety related item, on my car that's inherently weaker than OEM. Some are willing to accept that for the look and that's cool, with normal driving they're perfectly safe and stop the car fine. I'd be replacing them ASAP if they're showing cracking for sure though.