i've never used drilled rotors, but (with all due respect) i'd have to disagree with the previous post regarding slotted rotors. they are noticeably better. besides allowing for out-gassing, they do scrape a little bit of the pads off with every pass under pressure. keeps them from glazing over.

this may have something to do with brake design, too. if they were overdesigned in the first place, may be the benefits of slotted rotors might not make much difference. for a 2200 lb civic with tiny factory brakes - different story.