I had 3M on my 2001 X5, 2004 X5 and also on our 2006 325. No fading or yellowing on any of these cars. They all used 3M product however. On my 2011 X5 I had the 3M ventureshield installed. Was $729 to have front bumper, fogs, head lights (they used a thicker material on the headlights) hood, fenders and exterior mirrors done...just get a reputable shop.

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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