After two years I have used the competitor Cherry Azuro before it has given up the ghost, I found the Logitech Mouse M185. It is slightly smaller than the Cherry product and therefore is also less comfortable to hold (average size hands). For a bit processing works better. The big advantage here is the tiny USB receiver (it is operated with 1x AA), in contrast to Azuro in the battery compartment of the mouse can hide. Otherwise, the M185 limited to what is essential: more than two buttons for left- and right-click as well as a scroll wheel is not necessary. But the latter acts as a middle button. On Windows XP and Ubuntu the mouse works without objection. The optical sensor is invisible. The scan works the same as the radio properly. The product is spartan, but preferable thanks to the retractable USB receiver and the slightly better processing my opinion the comparison product from Cherry. Priced there are no major differences.
Who vacillates between the Cherry Azuro and the Logitech M185, which can take a look at my comparison photo in the gallery!