I don't like them. Never felt secure and that's with my 4000 pound M5. I never would seriously consider it for the X5. I especially don't like that there's only two ways out from under the vehicle.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim