I do a bit of voluntary work in a place that has the full size version of these. My main gripe is the joystick. The ball bit is screwed on, not joined to the stick, so the ball keeps needing to be screwed back tight. Also I'm not sure if I'm just remembering things differently, but I'm sure the original sticks were longer. These feel too short for me.
Pretty sure the ball bits are always screwed on (Archer: Phrasing!). If it's coming loose some locktite or nylon plumber's tape should hold it in place.