FAQ:

What are the benefits of cross-drilled/slotted rotors?
The simple answer is asthetics! Slotted and cross-drilled rotors do not improve braking nor is the weight savings beneficial. Often, the slots and holes cause quicker pad wear and shorter rotor life due to cracking and warping. You've hard that the unspring weight savings can help greatly, false. It is beneficial on a vehicle as weight sensative as a motor cylce but not on a street car like the a Contour. Your best bet for good braking and pad/rotor life is a quality set of blanks!