I tried it once. The gyroscopal control option is what I want and the fixed throttle is really a wanted feature, but it has no video feed, controls are stil just from birth, needs a lot to beat the ryze tello app
Linear throttle response solves a number of issues some pilots complain about, a multirotor drifting or turning when giving 100% throttle, or getting oscillation. You can also squeeze a bit more performance out of your motors, and it helps your quadcopter to feel more “locked in” and less sloppy, especially when you are doing extreme acro. Note: This is not the holy grail for all the problems in PID tuning, but a good start.
btw, sorry to read about your firmware update problems - hard to believe that it was not tested more. Why don't you email them and ask them to put a link to the previous firmware while they sort out the problems with the new one ?