I try to avoid the dealer whenever possible...however for alignments I always go to the dealer only! Call up Daniel's BMW.
Assuming you have a competant tech, they follow the prescribed BMW process to the T, use the sand bags as weight, and insure the steering angle sensor is calibrated.
The steering angle sensor is mounted at the base of your steering column and tells the DSC / ABS systems the steering angle of the car in conjunction with the yaw sensors. This all works together for your stability control. If you have an alignment done at a random local shop and don't have the angle sensor calibrated, then the computer may think you're turning slightly even if you are physically going straight.
Just my two cents, but this is a dealer service for me.
Last edited by Mark M; 12-28-2012 at 12:32 PM.