Oh, rotors warp, alright. Definitely. Anyone who says otherwise can have a look at the set I took off my 202 a couple of months ago. They were out almost 1.5mm. Horrendous. The new set (MB parts, including pads) I put on warped too, within 3 weeks of putting them on, although the performance is not annoying enough to replace them again yet. They were put on properly, wheels always torqued properly, bedded in properly, calipers checked and bled, etc., etc. They warp. The originals never did. They just wore out. I wonder if MB has gotten a bad bunch from a cheaper supplier to use as replcement parts in the last while.