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Rotors for the G30 come in two flavors: the two-piece OE ones with an aluminum hat riveted to a cast iron disk and aftermarket ones that are often a one-piece construction (no riveted hat) in which the entire rotor is machined from a single casting.
I seem to recall a thread on the F10 forum that claimed the two-piece rotors were prone to warping. Assuming that your rotors came from a BMW dealer they are likely two-piece ones. If you should replace them, you might consider one-piece aftermarket rotors. Since you're paying the freight on these replacements, just go to a decent mechanic who can do the entire job a lot cheaper. There is nothing magical about pad and rotor replacement requiring trained BMW techs.
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