Best ergonomic mouse! It takes some time to get used to trackball. Build quality and materials are really good. Overall comfortable design. Good for wrist and shoulder pain. I wonder why this mouse is not mainstream...

Been using it for a few weeks. It takes getting used to from a traditional mouse to this trackball setup with your thumb. The precision suffers as well but you'll get used to it after a while. I'd suggest seeing the pointer speed a bit low initially so that you can make finer moves on the noise easily.
Can't recommend it for gaming though. I think the pointer just goes haywire as compared to a traditional mouse.
I work on a deal so size isn't an issue but since you don't need to move the mous...

It’s just about how I expected it to be totally user friendly. Certainly go for this if you’re tired of moving the mouse around and if you sit in front of you pc/laptop
the whole day.

Take some time to get used to, not for gaming, totally different from traditional mouse, more like a trackpad, 2 more customisable button would have been good
Very hard to switch between 2 devices as switching button is in bottom.

I have been using 2 M570s for 8 years. Bought this M575 as the old ones had seen better days. Equally impressed if not more. Very comfortable, accurate to a pixel and say bye bye to carpal tunnel syndrome.

Good

Worries like a charm even after months

Pretty good trackball, I've been using it for past 4 months. It solved my problem of wrist pain I used to have when using conventional laser mouse. My personal opinion : Cost is justified

Best product

Good but need to adjust for some days to be habituated for its usage