Personally, I like the X3's without the kit - although the kit does look incredible on the blue! The back plastic bottom totally works for me (looks and function) because I live in a wet and snowy climate where it helps prevent rock chips and dings.

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MWBBMW
2006 X3 3.0i Highland Green Metallic, Sand Beige Montana Leather, Steptronic, Premium Pkg, Cold Weather Package, Privacy Glass, Xenon Headlights
2007 328i 6-speed, Black Sapphire Metallic, Sport package, Black Leatherette, Heated Seats, iPod & USB Adapter
If God had intended man to walk or fly, he would not have made BMWs!