Reason: identifies the key dissolves into nothingness and after a relatively short time (within 2-3 months)
Against the functionality and comfort to both components is absolutely nothing wrong, only the quality of the glued label is simply a joke.
Logitech seems to be aware of this problem, because the set will be replaced without difficulty (and they will have to do safely at regular intervals of 3-4 months with me!).
I have also been asked, but to send me another model with properly printed or lasered Keys - but Logitech says "No, do not go, but you get like replacing your set."
At this price you could but expect the letters are indestructible, right?
I would recommend the keyboard only persons who do not have the touch of a fingernail and they also use as little as possible (haha ...) - but I can gather from other reviews that already men have reported about "dissolving letter" - the is not just a "women's problem".