gresch, Maybe it's because no one has ever heard of it?

From its website, it looks a little too "amateurish" for use on an expensive car...

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2008 X5 4.8i | Wheels: Summer> style 336 20" RFT; Winter> style 214 Ferric Grey 20" RFT | Aero kit | ESS E-Flash tune | V1 | LCI Rear Tail Lights | Coding completed | Engine replaced at 90K