Drilled or slotted rotors are designed that way to 1). Allow for improved cooling and 2). Better "self-cleaning" of the rotor's and pad's surfaces. For most of the applications you'll encounter with an Outback, I'd believe that installing these types of rotors or having yours drilled, won't really improve things.Knowing that the OB is designed for some off-road duty, does it make sense to install drilled and/or slotted rotors? Seems like they would trap debris and be worse for wear.
I had them on the wife's Cadillac STS along with EBC red pads, but it was a heavy street machine. She loved that car. Considering installing them on her Impala when the time comes.