It depends on what you want to do with it. It's a useful certification to get jobs, but a lot of them are really difficult jobs with not great pay. I think it depends a lot on the area, though.
I was considering getting my CNA to get a specific social services type job working with disabled kids. I decided against it because the other CNA jobs available in my area were difficult and low paying nursing home jobs. I didn't want to do school to end up making a couple dollars more an hour than McDonald's pays.
Back when I used computers for work I exclusively used trackballs because they're better for my carpal tunnel. I switched back to mice because they're better for games and I rarely use the computer for hours at a time anymore.
I've been wanting a manufacturer to make a good combo trackball/mouse for ages. I think it could be an amazing input device if you could use the mouse part for big movements and the trackball for fine control.
I found one on AliExpress, but it had poor quality sensors, a tiny ball, and no ability to adjust dpi independently.