Slotted rotors apparently look cool, and might help with the no brakes if you haven't touched them in an hour on the highway when it's raining.
Other than that, you're paying to have material taken off your rotors.
Salt will collect in the slots, and might end up making more noise than if you had solid rotors.
People say things like, you can't switch between conventional and synthetic oil, without any proof (of which there is none). So I challenge you to find evidence that slotted rotors would eat pads faster.
