Originally sold for $500 it has been superseded by several generations. That said, for the casual user or hobbyist (I'm a Maker) this is a great deal and one that will put a 3D Mouse on your desk that would be hard to justify at current prices.
I upgraded my SpacePilot FW to 10.4.10 and it works great with Fusion360 on my WIN8 PC. It shipped promptly, in excellent packaging and condition.
I'm running Windows 8 drivers in Windows 10 unit. I'm using this with viacad pro 10. It works well and I have macros built into the buttons. Very happy.