Much better than stock equipment
The stock rotors and calipers (with race pads equipped) were not providing enough stopping power for the Corvette Z06 on the Sebring raceway. The StopTech kit comes with street pads, so I ordered StopTech's SR32 race pads to use although the pad shape is a common one available from many different vendors. Regarding slotted vs. drilled rotors: The StopTech engineer said that drilled is for show; slotted is for the track. It's like I am driving a different car! Very happy!