Minor drawback: the switch is very small and the on direction is opposite to ergonomic principles. However, it seems the mouse doesn’t draw power when idle, even if it’s switched on. The manual doesn’t mention this. As with almost all similar mice, the gallery lacks an important bottom-side photo. If any seller is interested, I can provide this photo free of charge.
A vertical mouse prevents carpal tunnel pain (my own very painful experience from long use of a regular mouse)Works flawlessly even at a distance of several meters.