Thought it more appropriate for the N55 subsection of the E90 forum, so please go here for a review:
http://www.e90post.com/forums/showth...1#post10158561
Executive summary: Removed JB Stage 1 after 3,000 miles. With the new software the lag is G. O. N. E. gone. Power delivery is amazing, car pulls much harder all the way to redline, and I know I am operating within the safe limits of the motor.
AWESOME. Comments in either section welcome.