I use to have an Avistar a long ago and I remember that it was so fun to fly and way better than any other trainer at our field. Of course I did not perform any 3D maneuver but it was fun anyway. I personally do not think that the pilot in this Video is using any gyro and regarding the gyro use on our models I do not think that they could be of great help. I have the G4 RealFlight Sim and it has the GP Yak with gyro and it is very easy to hover (Even for me) but in real life things are like different.