Sensor is terrible, missing buttons

Sensor is in SO POOR and barely works on a flat mouse pad let alone my leg or laying down like I sometimes migrate to after hour 8 of sound/video editing

good mouse, but you need to plug in a usb thing, and the optical sensor is good, not great

The new version feels cheap, has removed the extra thumb button & has an inferior sensor

Sensor is in the worst place ever as well which multiplies the fact that it can't sense anything on any color

The new revision overall looks lower quality and logitech is using a cheaper lower quality sensor for the laser

But the sensor broke on me less than 6 months after I bought it.