They are great, but I have two issues with my left handed one:

• Right handed people just cannot use it, I can’t just give someone else my mouse for a minute.
• For some stupid reason, the left and right mouse button are switched, so now I have to switch it back in software, so now the buttons on my laptop touchpad are switched.

I tried it and I got wrist pain that I never had from the horizontal mouse

I guess my body is completely set? (been using a normal mouse for many, many hours since I was 10yo)

A cautionary tale if you’re considering.

Years ago someone left my employer abruptly, and on their desk was left a fancy vertical mouse. It sat there for a few days, and I kept glancing over, at first ambivalent, but as time passed the temptation increased. I debated the dilemma of becoming a vertical mouse person, was that really for me? Eventually I succumbed and thought hey it’s worth a try, see what it’s like to be one of them… pure learning opportunity…

Then something happened… I got used to it in about a half hour and in the first day my precision improved. A sudden urge came over me to tell all my coworkers, was I really becoming one of those people so fast? Trying to resist was futile and within a couple days I became a vertical mouse person, always wanting to tell everyone how great they are, constantly resisting the urge. I forgot what life was like with a horizontal mouse, and I never looked back.

Trackball gang represent

Thumball with 3D printed vertical stand yes I got asked about it a lot