A premium product, let's say, there should be no gaps under the buttons, no programs jumping back and forth that minimize any full-screen application. C grade.
Pros
The keyboard itself is good. Convenient, I use it for work and printing. There is a second keyboard, mechanics, took for games. So, in comparison with the mechanics, typing has become more convenient, the hands lie in one place, the keys do not dig into the palms, easy access to a larger keyboard area with smaller hand movements. Large button area, less likely to miss. Blind typing has become more accurate. Very low, almost flat. These are all pluses.
Cons
Untidy lighting. Light breaks through the sides and bottom of the keys. And it's uneven. Some keys let light through from below, some do not. Even though you hardly look at the keyboard, the untidy light still gets into your eyes. It could be better for the money though. Minus score.
Software that, with some kind of pop-up and immediately closing application, minimizes any program running on the whole screen. Pops up regularly and then disappears. A couple of times I noticed a highlight icon on this quickly disappearing icon. Fortunately, the settings are not particularly needed, so the program was demolished, the problem disappeared. In short, everything that concerns the backlight is so-so. Another minus point.