one other thing you forgot to put andy, is about grip roll. i dont think i have ever found any problems with grip role with my x6 compareed with the b4. also the driving style is completely different. the x6 has to be driven more like a real car, its all about your lines because of the amount of grip it has, the back end dusnt step out like a b4. it grips amazingly on smooth 'slippy surfaces, such as gym floor compared to the b4.
i have to say i am also very pleased with the car aswell.
it's great having the team drivers at my local club, they are so helpful with anything i come to them for, eg. setup help.