Having been through all this I know how you feel and I hope they get you a new car, I felt exactly the same, would never touch another BMW etc but it all changed when I got the selling dealer principal on my side and he really did a good job.

In the end I was offered the car back plus $4000 compensation, a new in stock car or a new car built and a free loaner. I took the new car build, its a 14 week (about 10 weeks to go now) wait but they put me in a 2010 X6 to start with and last night swapped it for brand spanking new 2011 Alpine White X5 40D M Sport with delivery mileage on it.

Whilst this has restored my faith in BMW they need to sort out their quality control and customer service, they are turning out too many high value vehicles with serious faults and taking far too long to resolve these problems.