Not likely that anyone here has used it, since it is a 1.0 product which seems to have been released only 2 days ago.
It is commercial software, 4999 euros for the source code according to http://www.independentsoft.de/purchaseplimus.html
Given that the source code is not readily available, it is a completely different proposition to docx4j and Apache POI, and more similar to Aspose (though at least Aspose to their credit have public forums)
Beyond that, it is difficult to say much. Locking this thread now.