I have the brembo cross drilled rotors and they do look damn nice of the X. They cost about the same is the oems. No cracking issues and they have about 80,000+ miles on them. They just look nice that's why I got them. And I drive my X really hard so the additional cooling is a benifit.

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2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer

2001 X5 3.0i Sport 335,448 miles & counting...
SMG M3 Steering wheel
E46 Stainless Racing Headers
4.6is Exhaust
Turner Pulleys
Afe Intake
Brembo drilled rotors
PowerFlex Bushings
Hualingan
30mm H&R Spacers rear
20mm H&R Spacers front
Bavarian Autosport High-Performance Coils
Active Autowerke's Performance Software