slotted and or drilled rotors

It's not snake oil if your under extreme conditions.
Daily drivers, hot rods, street machines need not apply IMO.
They just don't meet the heavy loads and abuse to bennifit from the drilled and slotted rotor.

A bigger disc, better pads & more Pistons in the caliper are a plus and more than likely all you'll need unless you actually race around in circles or a road course. I can also see there use in aong distance interstate ride.

But until that extreme level is reached, most every person I have met and read that used them complained about not actually seeing, feeling or actual measuring a better braking experience.
(Though none have mentioned anything about a cooler fluid temp or longer brake/rotor life.)