Correction, the WILL warp over time. I had mine cut at 6k miles. At 13k the pulsation was BAD. I then discovered I could minimize it by using a very specific torque sequence. But, the pulsation came back, not nearly as bad but it did. Finally Chevy changed out the rotors for me, and I haven't had a problem since (using the same torque sequence).
Heres the important part: DO NOT LET THE MECHANIC USE A TORQUE STICK AND AN IMPACT. NO MATTER WHAT THEY SAY DON'T LET THEM DO THIS.
Use a torque wrench, step the torque down. And if you use lube on the threads (as you should, but chevy says no), use 85ft-lbs. 100lbs dry. If you use lube, and tighten to 100lbs, you WILL kill the studs.