I haven't used them, so these comments are based on the info you provided.

They seem pretty expensive for a purely cosmetic upgrade. Don't expect any performance upgrade, despite the exagerated claims on the web link. I have never had a warping problem with OEM rotors, which incidentally are also coated to resist rust.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue