Deja, I tested up til the F22, I have one F22 stick from beta, after that I didn't beta test, however, I was responsible for one design modification to the springs in the older sticks, they used to have the springs ride on a bare thread, I sent them a 3D-CAD drawing showing them how using a solid casting or bushing would lessen the chances of springs breaking due to the surface it rode on...months later they went to a cast-type whereas the spring rode on a smooth surface.