Got my disc drilled a couple years back and it still squeaks the tiniest bit sometimes, though not enough to bother me. Can't say it was all in the drilling though, as I redid the whole brake system then, too - had it apart about ten time before I finally got it right but had the sense to leave it that way once it was dialed. Got a new rotor and hope to get it drilled and go dual disc this winter because the single disc just does not stop grab hard enough...