I have had nothing but a great experience with the upgrade. 4 batteries Monday, 2 Tuesday and 3 today. I live in Alaska so I was taking advantage of the decent weather here! Everything went well, needed compass calibration the first time after upgrade, but none since. My favorite item is the controller being able to adjust exposure up to .7- to .7 plus EV As I have never had major problems with updates the exposure adjustment to me is a most valuable add-on.
EDIT: 1 click at at a time and you can go from -3.0EV to plus 3.0EV. I like to shoot in manual mode and this is like being able to change N.D. filters in flight. I am actually more of a photographer than a pilot so this comes with great welcome from me! This was a feature I knew I was not going to get with the air as apposed to the pro, but now it is here and I am so pleased with DJI.....