Positive:
+ Pleasant keystroke / pressure point and fingerprints
+ Good compromise of dimensions / format / size (weighing between usability and the possibility to transport it)
+ Fairly flat
+ Only minimal key noise
+ Charging via microUSB
+ Multimedia keys (and the function even under Andorid)
Other:
* LEDs for wireless connection status and battery charge indicator
Android and German keyboard layout:
As already mentioned above, I have tested the keyboard with two Android devices. With both an auxiliary app was necessary so that the German keyboard layout is translated correctly for the device. By default, interpreted both devices, the keys to the US layout. I decided in the app for a paid app, since the free part calling for a terrifying set of permissions. Just as these apps so then can read along every keystroke, it seems to be cautious with sense at this point.
For this how long the battery really I can not say anything because I only own the keyboard one week holds.