I have successfully tested the Cheerson CX-20 Auto-Pathfinder (also called the Quanum NOVA). This quadcopter uses an APM v2.52 with the ArduCopter v3.1.2 already installed. It fly very well and all the Arducopter features are working very well....
Above, a video during the maiden flight of the CX-20 has been taken with a GoPro 3 "Black Edition" mounted on the anti-jello mounting base.
Test conditions: Wind 22 Km/h gusting 33 Km/h
The APM 2.5.2 (with an external magnetometer) with the Arducopter v3.1.2 handle very well the CX-20, the flight is very stable in loiter mode in spite of the strong gusts.
Below the factory PID installed:
The flight modes set by default:
I have added a telemetry datalink and tested sucessfully the Droid Planner v2.0 (Android) and the Mission Planner (PC).
More infos at: