Well, I too have been sceptical about grooved and drilled discs an felt the brakes in my 24V auto, (gen discs and pads, overhauled calipers and braided hoses) were good for effort and feel the latest 80 I just bought has grooved and drilled discs, gen pads and new toyota hoses and the brakes feel fantastic. I drove it a couple of years ago when the brakes were overhauled and they felt very effective then too.
I think there are one or two others on here with the same discs who may add to this.