Some gray dots

Apart from the points I will quote, this set is perfect.
At the keyboard:
The function keys do not seem to be used for games, it may be necessary to fiddle.
There is no digital or Caps Lock indicator.

At the mouse level:
This one has some time of the difficulties to be fluid.
The wheel is strange and is only for the office, do not even think about using it in play or elsewhere.

If more that I did not expect, in the receiver software to configure and customize keyboard and mouse.