I've got the drilled and grooved discs (wish I got them painted as the middle has gone a bit crusty looking), running them with the mintex 1144 pads they are SHARP from cold.
Sounds like a jet spooling down when breaking from 70 mph which is pretty cool, but do get the odd squeak and slight grind noise at slow speeds. You can buy a mintex anti squeal kit to help this.
If you're after a bit more cooling but no noise go for drilled as its the grooves that create all the noise. Dont bother with dimples waste of money. Meganes have drilled as standard and I had no noise what so ever.
Highly recommend these discs and would buy again, you do get reminded how well they work with the pads when you get a plonker pull out infront of you, pulls your face off! Roll on track season!