... Completely OK !!! 1

I do not know what who expose those who devalue this keyboard as a cheap part.
Sure, there are other, even with metal housing, which have a completely different quality of the haptics.
But if you compare apples and oranges, because that's a very different price league.
For the money, get what you can expect. Since usually most 30% below market price and thus just 5 - 6 euros more expensive than a keyboard with cord, one can speak of a favorable price.
And even if it is plastic, we can not speak of cheap goods here IMHO.
I have my old Logitech (with cord and connector PS2) replaced with this keyboard, because I wanted to have keys with a smaller stroke. I therefore run a notebook docking station, it should be compact and not dominate the desktop.
Typing is much more pleasant than on the old Logitech with the high key and also the noise is less. I'm talking about, mind you, from writing with 10 fingers ...
And the buttons are not further apart than with other keyboards, what you want to accept because of the gaps ... The distances (key center to key center) correspond exactly to those of my old (and bigger) keyboard.
Despite it is still a lot more compact, which was realized with a different key arrangement.
That may interfere with one or the other, but as I often work with notebook, my tolerance level when it comes changing key layouts, quite high ... :-)
Very nice also the rubber feet, which make the keyboard very slippery.

Who is looking for a compact wireless keyboard with short key travel, will find it here.
In addition, through the various designs is also choice when it comes to the look.