The concept is interesting, any autopilot can save a jet from being lost due to attitude seen wrong by the pilot. Or almost any reason but a flameout and stall etc. I have flown the Ardupilot for some time, and would not hesitate putting it into a jet...i fly multirotor stuff for work daily and thats basically autopilot all the time, not waypoints that much but in terms of GPS hold and stabilization.
tuomas