I have a 2005 2.5L Z4 automatic. It seems to me there is a slight hesitation when I start from a complete stop. Then it takes off. Not smooth at all.
This is in contrast to my Toyota truck (stick) which does not hesitate at all.
Also, I was messing with the S/R and clock buttons when the odometer changed from miles driven to number 6. I managed to increase the number to 8 before it went back to mileage. Anybody else ever done this?