Out of curiosity (as you both clealy use these trackballs), what's the selling point of them, what's attractive about what they do?

To me they look like a giant upside-down mouse, where your fingertips are the working area instead of the mousemat or whatever.  What happens when you want to draw, say, a big curvy line?  Surely that would be a nightmare if you have to hold down a button that isn't moving as the device does, like it does with a mouse. And just to be clear, I'm not knocking a trackball, I know a lot of people like them but I'm buggered if I understand the attraction - I literally cannot think of a single task I could use it for where it would be better than a standard mouse.

I like that it's large and substantially built, I'm all for that, but the concept, I don't get the attraction compared to a mouse.

I used the Logitech marble for a long time an it worked well but as you say it has limitations so I also have a Wacom tablet.  Once I retired I used the computer a little more and found the trackball was not good for my hand so more recently I have moved on to using a vertical mouse.  It seems much more natural and I no longer have the cramp in my hand. Whatever mouse I use it will still be used in conjunction with my 3D connection navigator which I would be lost without.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.