I tried using a vertical mouse for a while. Trying to click with it without the mouse moving at the same time made me want to throw the thing across the room. It causes you to grip it much harder than you need to grip a regular mouse which eliminates any ergonomic benefit it theoretically has. If you need ergonomics, focus on the basics like desk, chair, and monitor height.
I absolutely wouldn't trust anker with a device that plugs into my computer after their subbrand eufy got caught spying on people through the cameras they advertised as storing the footage local only but were uploading them to the cloud and it looks like it's not that different in shape from the logitech lift or mx vertical which you can buy directly from logitech and not on amazon maybe I'm missing something but it just looks like a standard vertical mouse though admittedly pretty cheap
Certainly there are other options; however, my positive appraisal very much includes the cost of the product. As well as the longevity of it, as I've been using mine for hours on end, every day for at least six years.
Zero. I went from growing the factory for a couple of hours at a time to however long my bodily and economic obligations allowed; however, as others have helpfully pointed out, there are better options and I wonder what my experience would have been had I chose otherwise.