mercedes uses cross drilled ones on their newer uper class cars ie new S. I have heard they do perform better and all high end brake systeams use them like brembo. also any new motorcycle uses rotors with a extreamly large amount of holes and i no one no-one who's rotors have cracked. In my non-perfesional opinon cross drilled rotors are a good upgrade although better break pads will help too.

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MPL
Son of mplafleur (forum member)
1980 240D (dead)
1988 mazda rx-7 250whp@10psi needs dyno of 15psi