I recently bought Pixhak AP and finally calibrated it on TBS Disco. It fly's really stable and reliable. The Twinstar is flying with APM 2.5 and same thing here, 6km fpv is a pure plesure.
Also wanted to show you our designated spot for drone flying and testing in Warsaw, Poland. Do you have a place where officials let you fly your drones? You hear a lot about restrictions in U.S and other countries. I wonder how is it in your place of living?
Best to All,