I have now bought this keyboard in Saturn (has been there about 10 euros cheaper), but they will return tomorrow. The reason is that the "metal plate" not just resting on the table but kept the right and left below about 1mm above the table by rubber bottoming. With the result that when said metal plate is not completely just is (but slightly "sag" as in my case), she bangs the table each time you tap and thus creates a very unpleasant Schäpper-noise, which I'm so not in the long run liked.
The touchpad works! Contrast well. An LED on numpad etc. would have been good.