I am lokking at getting a rooftop carrier for my '07 X5. The BMW one is $320.00 for the rails and $1,795.00 for the box (CDN$). Anyone have one of these and are they woth the money? Any other suitable aftermarket carriers avialable for this model?

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2013 BMW X6M-current
2013 Audi S4-current
2007 BMW X5 4.8i (E70)-sold