Elecom Wireless Trackball Mouse with 8 Programmable Buttons & Tilt Function - Ergonomic M-HT1DRXBK Black for CAD Design, Graphic Editing & Office Work

I have used several trackball mice over the years, always large ball mice like this one. On balance, this is my favorite so far. The form factor is very ergonomic, although sadly on the small side for my very large hands - but honestly, that's unsurprising. It is, however, a large mouse. So far as form, I prefer the form of the ploopy but this Elecom has a much smoother ball, and a much more reliable scroll wheel so it is my favorite. I have also owned kensington trackball mice which were also excellent and very smooth, but both broke within a year. Hopefully this elecom will last me better.