LED Color: If you have the LED lighting switches on white some a red tint and a button had a bluish tinge (unfortunately both color prints simultaneously at different keys, otherwise you had to reduce red via the software).
Temperature: The LED in the white mode when not greatly reduced are very warm.
Well I found:
+ Ergonomics. However, in each person differently
+ Keystroke: The macro keys high but not too high. Why +? If you want to lift the mouse to press the thumb on the macro keys without triggering them.
The mouse is kept in a matt white with a coarse surface.
The edge at the end of the mouse does not feel it.
The G-Shift button resets other keys. (Dragging a window suppresses G-Shift and the left mouse button holding it is solved. (According to Logitech wanted because you can reassign mouse also 1 and 2 on G-Shift)
For a 80 Euro product bothered me the temperature when using my favorite color most. The red and blue tint (unfortunately both color prints simultaneously at different keys, otherwise you had to reduce red via the software) bit her while with my color scheme white black but was rather unimportant.
EDIT:
Logitech responded to my question about the color cast that the key had broken down with the blue cast and that I should replace the mouse from the merchants.
