I problems with Litchi. been using for a couple of months. Using Nivida K1 and Phantom 4.
It doesn't always RTH. It lands where it is.
Pano, I have learned, works if you shut off all ACs. If not, it will gain altitude very fast, at some given point, and I have to change to Sport mode to gain control.
Mission Hub works fine. Not sure about avoidance systems working, in missions, I just leave them off. The camera controls seem unresponsive. Try to change things andit doesn't respond.
I use it because Go4 crashes every once in awhile, but every flight. Never know when, I just look down at display and its gone. (??????)