I've heard of it, never tried it. I don't care if my burner gets discolored, and I don't have the time to reapply/retreat after every wash (I assume the coating would come off with water).
Then again, people spend an inordinate amount of time polishing their kettles to a high shine. I don't get that either.
Maybe if I shelled out for a Blichmann I'd be more apt to avoid discoloring it.