Just to add, my first flight with waypoints (P3p on ipad mini), I set first waypoint around 15ft up, 2nd waypoint was about 6ft height, third 15ft, I played the flight and it was fine, then replayed a second time immediately while still in flight and the P3 would have bumped ground if I hadn't flicked back into p-mode, so the barometer is not consistent/reliable I would say +/- 10ft or so.
I have since used waypoints a few times and do like it, both for slow/timelapse, and for accurate flight between specific points, especially with camera tilted down.
I noticed last time I flew pulling back elevator will 'rewind' along the waypoint path, not sure if this is a new addition or always did this, but it gave a great effect for me, I keep meaning to try this as I am guessing forward elevator may 'fast forward' the flight path. I keep a close eye on any obstacles to check I am over them, and have finger on flight mode switch to flick from F to P to stop the flight if it looks too close.
