I love this BS...
Taken from the ART website home page...
"Slotting Advantage:
Slotting our rotors adds additional cooling by aiding the out-gassing effect, in turn increasing braking performance in wet & dry situations. "
If your brakes actually benefit from the slots out-gassing of the pads, then you probably also have to frequently tune your carburator and run leaded gasoline.
The "out-gassing effect" from brake pads has long-since been eliminated in almost every application. (almost = very few race cars still run the old-style pads) Out-gasing occurred with the old style brake pad compounds that used asbestos, as well as other elements that are no longer used in todays pads.
So the "out-gassing effect" is an old myth.
However, the slots DO prevent some glazing in extreme conditions, like heavy towing downhill or race applications. But, again, if you have a glazing problem, try using pads that cost more than 99 cents each.
I'll probably get some anyways, just because they look cool. Hey, at least i'm honest about why i'm buying them.