[VLM]

I have three computers on my desk with three trackballs side by side and the keyboard on a KVM switch. Well really just a "K" switch. Works pretty well for me. I use classic wired trackballs instead of your marble. I'm not happy that they're long discontinued but I stockpiled quite a few when production ended. I hate the idea of wireless, last thing I need in my life is one more thing to worry about charging to replacing batteries.

Trackballs are much faster. Given that I might switch from keyboard to trackball thousands of times per day, saving just one second by knowing where the trackball is, saves quite a bit of time. I also find it faster and more accurate for selection work to use my thumb instead of the much larger muscles used for mice.

I don't do much gui work other than clicking links in a web browser but when I do I find the trackball to be superior.