The app works for me without problems. While recognizing the fact only books that are on the hard disk, if you can live with this "shortcoming" If it does what is required.
You create your own categories, dyed his books to want one ... the colors are unfortunately represented only wrong in the shelf list.
And you can see the books on the shelf unfortunately only sort by relevance, author or alphabetically well.
Since the latter is not otherwise regulated by the Kindle, I can only criticize the color display when that is fixed there's 5 *.
