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The term "will not last the distance" was a figure of speech, meaning something that will not last as long as a new.
Direct meaning, turned/ground rotors will end up obviously thinner than new, thus will wear out of spec faster than new, thinner rotors tend to warp much more easily as well, but I'm not telling you anything you don't already know.
When dealing with track conditions and track rated pads, everything is thrown out the window, for as you stated "depending on the aggressiveness of the pad they can chew up rotors pretty fast". So given the sole use of rotors on the track, I guess you really have nothing to loose, as they are going to die an early death no matter what.
As far as new replacement rotors, I do not know the quality of Sebro, but I would be suspect, simply due to the price point.
Zimmerman are direct O.E.M. rotors. I have bought factory direct Porsche rotors for my 944 turbo that came in Porsche sealed boxes, but inside were rotors with a Zimmerman sticker right on them, as well as a "made in Germany" sticker, so.........
Mark
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