My 2007 3.0si was so bad (from day 1 of ownership), it was returned to BMW (details are not to be discussed, per our legal agreement).

While the 2008 4.8i is better, it is not what I expect from a BMW, espeically a $70,000 model.

i-Drive failures, battery warnings, poor A/C, multiple, various and very frequent warning lights, absurdly poor gas mileage, door locks malfunctioning, auto tailgate randomly stops working, reverse camera is a total joke, no heat reflecting glass, radio/satellite pre-set buttons erase themselves, or re-set to random stations I have never used, date/time erases itself.....

I have spoken with A LOT of new X5 owners, and I know that I am not alone in believing that BMW and the X5 should not score top honors. Sorry.