I had a set of PowerStop slotted rotors on my SHO and they were junk. Went to cross drilled rotors and they were 1000% better than OEMs. The idea of the drilling is to dissipate heat better. OEM rotors have a tendency to warp under high heat, ie., repeated hard stops. The holes allow air to circulate better and allow the rotor to stay cooler.
Depends on how you drive too....if you are a "normal" driver, you won't notice a difference with drilled rotors. If you like to brake hard and/or drive in heavy stop-go traffic, the drilled rotors will last longer due to their abaility to resist heat build up.
Stay away from slotted, as was mentioned, they are ineffective.
