++ The design is very nice and works through the metal-colored edging noble
+ From the haptic ago is hardly anything to complain about - except maybe the lateral function keys (see below)
Now, however, on the criticisms:
- Quality of the components used can offesichtlich much to be desired: State of delivery worked in two mice the mouse wheel is not correct (middle mouse button worked only sporadically), with two mice (also in delivery state) the right mouse button always rattled in 4 mice could during operation (particularly in quiet environments) a high-frequency, very annoying whistling sound at every mouse movement clearly heard (as tinnitus!) - this occurred in 1 or 2 mice only after days or weeks on strengthened and 2 right from the start
- Final absolutely deficient in the production, for the reasons mentioned above
- The 3 function keys on the left are too far "backwards" ie you have the thumb pretty curve around to be able to use - ergonomic Währe it when the keys would be 1-2cm further to the front edge
- The 3 function keys are on the left too close to each other (especially the zoom button below the up-down keys) and thereby sometimes you caught the wrong button. A marker (such. As to the number 5 on the numeric keypad with keyboards) would help for a better orientation.
- Mouse is quite large and therefore suitable only for people with large or even very large hands and only then it is also ergonomically "well in hand"
- Battery life depending on usage between less than one week (intensive use about 8 or more hours a day) and 2-3 weeks (about 4 hours a day normal office applications / Internet). When the size of the mouse it Währe certainly not a problem directly rather than just 2 1 battery (standard AA battery) unerzubringen and thus to achieve a significantly longer duration
- Battery level indicator inaccurate (1-2 days full 2-3 days 2/3, 1/3 and 4-5 days 2-4 days empty)
Conclusion: has a sophisticated but ultimately the money does not begin to value because the quality leaves much to be desired. The Logitech customer support is indeed great (fast and free exchange), but what good is it if the product is obviously of fundamental materials and workmanship! For the price you can certainly invest a few cents more in higher electrical and mechanical components, and above all a better final. I ultimately decided on the wensentlich cheaper Logitech M705 - although one has to some small drawbacks make (a little smaller and a function key less) but it does not whistle at every movement, a veeeery long battery life (with 2 alkaline Mignon reportedly up to 3 years ) and good processing.