Got the car back from the dealer, all updated with the latest ECU SW and DSC SW. From the first hundred yards after some nice oversteer out of the dealer lot, I could tell the car was faster, better, more responsive.
They did this update to fix a SES with a throttle valve actuator error code. I wonder if it's the same type of trouble that has seen a few forum members replace the throttle actuators, at $800 a pop. If BMW thinks they can cure this with SW, it may be a cheaper alternative.
If you have the chance to get this update, based on my experience i say don't hesitate.
2004 Z4 3.0
2014 X1 28i ED
2015 F80 ED in June