Slotted, drilled and slotted, etc will last longer without warping than the regular casts. The thing to keep in mind is this, most people do not properly maintain the other parts of their braking system by changing brake fluid regularly, flushing powersteering fluid on vehicles equipped with hydroboost systems, etc. Lack of proper cleaning and maintenance to calipers during installation, lack of replacing the little metal clips around the pads. All these things factor into how well the brakes function and last. I have heard all kinds of horror stories, but in the end, once you get to the source ((The person with the actual problems)) you mroe often than not find that they had no idea about the other maintenance items to keep up with, they just thought rotors and pads was it.
That being said, I have run the R1Concepts Eline series rotors, Posi Quiet ceramic pads on my wife's Denali for a year this November on the front and Feb will be a year for the back. They perform GREAT, have not rusted, warped, cracked, faded or eaten the pads up.
I also have the R1Concepts Premium rotors and Posi Quiet Ceramic pads on my 03 Dmax and have the same to say about them. They have been on the truck for almost four years now and I have used that truck to haul loads most people would never put behind their 3/4 ton trucks.
PLUS, right now, I am offering an EXCLUSIVE 15% off on all R1Concepts brake parts with free shipping on all orders over $99.
There are several members here running the R1Concepts brakes, if you go through the older brake threads you will find that you RARELY hear bad things and when you do they are usually second hand...
Click the link in my signature to check their catalog.