I have had the Space Mouse Pro for about 2 month now and i love it. It took me MANY years before i convinced my self to buy one.
But.... Sometimes it just don't follows my orders. It seems to works perfect with your demo, but less perfect in Solidworks part mode. But in Assembly mode it moves the object erratically. Same happens on both my laptop and my stationary workstation.
The issues:
1, I'm spinning an object around the blue center spot at the same time as i move it up/down/left/right with great control, suddenly it just shots of to left (or right/up/down), and i compensate it by pushing the control to the right, but that just accelerate the left movement.

2, Locking the spinning, but still twisting the control for an imaginary spin, the up/down/left/right movements are MUCH MORE accurate...
Also, after installing the SpaceMouse Pro driver 10.1.4, my regular mouse, a Corsair M95 started to ignore mouse button presses sometimes. It happens very rarely but anyway, It is SURLY linked to the 3DxWare installation as the same happened on my workstation back at my office after it got 3DxWare installed.
Thanks,
Z