And delivered. First charged overnight, in the instructions is 3 to 4 hours. The night was long. The first pairing has worked wonderfully. The Nexus 10 with Adroid 4.4.4 recognize the keyboard without problems and I can set keyboard layout to be used. That works wonderfully, even if one switches to German.
So I've tried, how well you can tap the keyboard. Unfortunately he beginning of the end. In all texts the "e" was missing. And "q", "w", "r", "o", "i" and "p" also. After switching off the keyboard and wait around, we went back. But not long. Finally, function "q", "w", "e", "r", "o", "i" and "p" almost never. All other buttons do, how they should. But to write a text in German with no "e", "i" and "o" is hopeless.
Therefore: Except expenses nothing had happened. And the expenses are borne luckily Amazon. A great pity, because actually the cover is good. Only the keyboard - at least the ones I got delivered - is not worth the money, although it was not really expensive.