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my $0.02:
brakes are a silly thing to cheap out on.
Rotors are cast iron.. A lot of aftermarket rotors (read - chinese) have poor castings, which (basically) contain air pockets. They can weigh a pound or more less than an OEM or OE equivalent rotor. This leads to hot/cold spots and warping, as well as corrosion setting in and having the rotor rot from the inside out, and even have chunks come off, which I've personally seen happen.
Some cheapo white box rotors aren't even the same thickness as stock, or even as one another; some are actually thinner than the service limit.
Long winded reply - stick with OEM/OE supplier stuff. The engineers knew what they were doing.
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