My 2007 X5 with the Sport Package and 19" wheels rides firm but very comfortable. I love the handling and it's only uncomfortable when you hit a pothole which is to be expected. I would not hesitate if i was ordering another X5 to get the Sports Package.

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Porsche 996 Turbo (Ruf 550)
Porsche 993 Cab.
Porsche 997 GT3
Audi A8
BMW X5 4.8 White, Black Napa, Sport, Technology, Premium, Prem. Sound, Cold Weather, Rear Climate, Multi-Contour, Sirius, HD Radio, Running Bds., Bamboo