before i crashed my old car i rebuilt all the calipers, got new rotors, and oem pads. i couldn't believe how well my car stoped. even at speeds over 100mph. oem set up works great with new parts quality parts. i did slip though. i didn't want to pay $130 for oem rotors. so for rotors i bought some raybestoujioj for the rear and some random cheap ass rotors up front to see the difference. when i mic'ed them out the raybestjoijoi were on spot, but the random cheap ass rotor i had to machine a little to take out the taper. i did it all in my class so i had all the tools you could think of (brake lathe, tons of mic's, ect..).
making sure the pads has a square flat perfect contact surface is key to the performance.