Although I have no experience with actually using cross drilled rotors, adding to the comments posted above, I would assume that the holes and such on the surface of the rotor would eat away more at the brake pads than your standard smooth rotor. Seriously, for normal driving conditions standard rotors are perfectly fine. Most street drivers get cross drilled rotors for the look.
I can also tell you that more than likely most shops that do rotor resurfacing will not turn the rotors down for you either if they warp or wear. Our brake lathe at the shop used two blades (one for each side) that were shaped like triangles. I never turned any cross drilled rotors, but I could almost imagine what would happen to the tips when it hit one of those holes. You'd more than likely get the lathe to lock up and blow a breaker. So most machine shops with those types of lathes probably won't touch them. Just something to think about.
