Is this worth buying? I've never used a trackball before,

>>60740101
I own one and use it every day, I think it's pretty good. It's symmetrical so if one hand gets tired, use the other one.

Yeah trackballs are worth it. This one's missing the scroll weel though, so you might need to either fiddle with the driver setting on Linux or use a 3rd party app on Windows to use it. But otherwise from what I've heard one of the best trackballs on the market.