Feel OK, the scroll wheel finely graded. The quality of the optics is only laser-like and so the precision that can not be compared with a proper laser mouse suffers. This is certainly a matter of habit, but unfortunately the process of sliding feet was sharp (at least on my model), which made the mouse according stiff. Taken together was not possible a lightweight, fast work.
Therefore only 3 stars - users with fewer demands get quite a good mouse.
The mouse returned, instead a few euros more for a Logi Anywhere Mouse MX issued. The arrived today and there are worlds betw. The two mice. The MX works even (as described) on my Schreibtischglaspaltte.