I've had them on all 3 of my X5's...the first were replica's and they were more for appearance than function as they were more narrow than OEM.

I use them to get in and out of my car each day, they are totally functional for me to step on. I've had issues with some minor stains in the past but just use a white magic eraser sponge to remove it. But I think the car looks better with than without.

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2007 328i Sport, Monaco Blue
2011 X35D - sold -Space Grey
2004 X5 4.4i - sold - Kalahari Beige
2001 X5 3.0i - sold - Pearl Beige
2006 325i Sport, Sonora Beige
2000 323i - sold - Sienna Red