Never used a trackball, looks pretty neat.

I've ran a thumb mounted optical trackball for gaming since 2004. The Microsoft Optical Trackball, with red ball/socket. Though I am not anywhere near my prime in gaming, mainly play large MP FPS. Took a few months to get used to and get up to speed. But once I did, pretty much dominated everything I played. Played on prac squad/ b team for some pro squads back in Halo PC, BF2, FEAR Combat Era. Def one of main tools that got me to top of ladders,top 1%, speed run records, and got me in /leading or running some epic clans from the past. I have 2 in rotation and 2 NIB. Guy in Canada rebuilds and services them for me once a year. They all have upgraded ceramic bearings, upgraded button components, completely disassembled cleaned etc..

All that said. I have never been able to get into the central located Trackball like this. I have tried MS. Logitech and some other smaller brands. It it clunky feeling, and for some reason you will get wrist fatigue with it, vs the thumb mount you seem to be able to go on almost endlessly...once you get used to. I would love to try it out, but at $150....thats a bit steep. If they come out with a thumb mount, I would def give it a try. Def follow them to see how it goes, perhaps reach out to see if they have any plans to make a thumb ball.