I was obliged to buy this adapter because CH Products doesn't give a d*** about whether its customers are happy.
I have a 20-year-old "Trackball Pro" which I use mostly for graphics editing. It's in perfect working order, but it has a PS/2 connector. The next computer I own won't have a PS/2 port, so I was giving thought to being ready for the change.
CH Products couldn't have cared less. Their current consumer trackball (which uses the same ball and case) costs $160, three times what I paid for the original. CH wouldn't give me a trade-in, nor would it sell me a USB board and cable, which would have made conversion a matter of a few minutes' work. I was told that, as I'd gotten 20 years' service out of the existing trackball, perhaps now was the time to buy a new one. I own several CH Products products, but you can bet I won't buy another. What is the point of purchase\ing a well-made, high-quality product if the manufacturer refuses to support it?
Anyhow...
I tried a simple "passive" adapter, which wires a mouse's PS/2 lines to a USB plug. To my surprise, this //did not// work. The CH trackball "looks like" a PS/2 mouse, so why shouldn't it work? I couldn't figure it out, so I looked for an active adapter, and found the ATEN.
Simply put, it works. And very well. There's a minor catch, though. It's not //quite// plug-and-play. You don't need drivers, but you do need to shut down the computer, plug the adapter in (with mouse & keyboard attached), then restart. Once Windows has gone through the (somewhat lengthy) process of finding the necessary drivers, you again restart the computer, and everything is copasetic.
This is a very well-thought-out product. It recognizes hot-key strokes (from the keyboard attached to it) that let you change the operating system in use and the keyboard's language. There are even two lights on the unit that blink when you're using the mouse or keyboard. And -- as it's a perennial gripe with me -- the user manual is clear and well-written.