I drove the X5M but it was just a quick drive around the block, down the stretch and back to the dealer. It was over lunch time traffic and the sales guy was with me! So I didn't really get a 'feel' for how it drives. I know it surely felt different than my 4.8i and the steering had a lot more interaction. My Current active steering even with dynamic handling feels like it has more play. I didn't get a good chance to take off from a stop light! Does it go like a bat out of hell or does it pick up speed as it slowly lifts it's weight? The Cayenne Turbo felt like the latter. It didn't exactly blast off the line, rather effortlessly pick up speed really fast...

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2008 X5 4.8i - Jet Black / Black Nevada Leather / Specs: Every possible factory option