Hi salty,
Trackballs are very handy, especially when you have limited, or no, space. I use a Microsoft thumb ball with the laptop, on my knee when necessary. The Microsoft had a slightly larger ball than the Logitech, but I’ve not seen one in the stores for some time.
Prolonged use of a thumb ball can lead to a sore thumb, so I prefer a Wacom tablet mouse for the desktop systems.
Regards,
Marty
Clanky,
The disadvantage in a space that rolls a lot: When the mouse lands on the deck, the ball pops out and heads for the scuppers.