Trackball vs a Regular Mouse- When and For Whom?

Logitech ERGO M575 Wireless Trackball Mouse - Easy thumb control, precision and smooth tracking, ergonomic comfort design, for Windows, PC and Mac with Bluetooth and USB capabilities - Graphite

X-keys L-Trac Red Trackball Mouse with Laser Tracking Technology, Made in USA

ELECOM EX-G Left Handed Trackball Mouse, 2.4 GHz USB Wireless, Ergonomic, Thumb Control, Tracking Roller Ball, 6 Programmable Buttons, Tilt Scroll

Wireless Mouse, Ergonomic Mouse with Trackball, Computer Ergonomic Mouse, Wireless Mouse, Easy Thumb Control,Precise and Smooth Tracking for PC, Laptop,iPad, Mac,Windows

I'm irrationally excited for this trackball gaming mouse