The air box takes about a minute to remove. Definitely makes the install 100x easier with it out of the way.
I've put about a thousand mile with the tune and still no problems at all. The car simply hauls when you want it to. When i have my car in sport mode and stab the throttle there is zero delay and the car just takes off like a bat out of hell.
I was able to get my traction control light to go off with my Xdrive F10 while i was rolling and then floored the gas pedal.