This was my 3rd and 4th flight of the Blade 350 QX quadcopter using the gopro hero2. It has amazing stability in smart mode flight. This is my first flying RC platform, and I couldn't be happier. Only crashed once so far, and I believe it is because of GPS drift and the safe circle in the Blade 350's smart mode. (Basically it's programmed to not run into you.) This thing has one of the better control systems of anything non-military I've seen in years!