About 18 months ago, when my Toyota mini-van had 70K on it, it was past due for a brake job.
I knew at the time that the rotors were too far gone to save, but my repair guy said that ordinarily with Toyota, you can turn the rotors down about 0.020 inch without a problem. Of course that's a pretty small tolerance, but that's what he said.
On my wife's Honda Accord, I made the mistake of failing to ask for genuine Honda repair parts. As a result, I had (and still have) shimmy in the front end despite the fact that the repair guy (a different one) has attempted to make it right twice now. There is no doubt in my mind that the shimmy is caused by either rotors slightly out of round, or defective pads. It isn't a huge problem now (after the 2nd attempt to fix it) and the car is 10 years old, but it's still irritating.
It's pricier, but no more of that so-called "OEM spec" parts for me. Gimme the factory stuff every time.