also bei mir klappt es schon ganz gut .einige, zum Teil wichtige Worte kennt das Wörterbuch (noch) nicht aber diesen Text tippe ich mit dem Okboard.
Danke fürs hoch laden!

EDIT:
Sorry for writing in german, I had to try the german dictionary for OKBoard

I just wrote some SMS and no longer texts yet, so this is my first Impression. BUt I can say: Looks very promising, only two issues which make usage a bit difficult:

• Some common words, which I would expect in the list of most used words, seem to be missing. E.g. "Danke" (=thank you) isn't recognized (nor is it in the suggestion list).
  
• Words with Umlauts are rarely recognised. I guess that this feature is not implemented in OKBoard yet.

Thanks for your work @Eber, @mautz and everybody else!

EDIT2:
to enter words with umlauts you have to swipe over the non-umlauted letter (eg Ol for Öl and uber for über)
so no problems with umlauts ...