Gerbil

Mouse was ordered Sunday night and this morning (Tuesday) arrived. => Very fast delivery (!)
After a few hours use can be said that the mouse is very comfortable in the hand. Had doubts at first whether it is not too small, thus leading to "cramps". This is not so!
Optically also an eye-catcher, the flat shape and the material also feels very good!

But one thing remains a mystery to me, and I have to complain about:
The 3rd button between the two hands, before the scroll wheel. This should actually be able to configure, so it also has a function. The manufacturer, however, no CD has been included, and on the control panel, this button can not prove also. The internet address of the manufacturer also no software.
Corrected me when I got this wrong!
That's the only drawback, because otherwise it is a really good mouse.

For the price probably the best what is currently on the market.
Definitely a buy recommendation! :)

Update 4/12/2014:

The CPI (counts per inch) button you can see the speed of the mouse pointer, as required, increase and decrease.
Accordingly, this button is not configurable, but quite useful!