Cross Drilled VS Slotted Rotors is it a gimmick?

[maldo]

I have read that its a gimmick. I have in a number of paces that Cross Drilled/ Slotted Rotors was to vent gases caused by the break pads but the materials used know don't create gases like they used to ... so what the real story why most of the after market company's do this?

Is it more for looks or does it really cool the rotors etc (i always thought if you cross drill a rotor you lose surface area and weaken the rotor (i am crazy for thinking this?)

Can any of the experts chime in to give their opinion.