Positives:
I particularly like that always the last page viewed is displayed when you re-open. The app is easy to operate by and large, you can change font size, line spacing, and the size of the side edge, and there are two alternatives to "black writing on a white background": you can also "Sepia" or "white on black" Set. Also you can adjust the brightness as required.
Negatives:
The Word Wrap and hyphenation is the weak point often. The text will appear sometimes "out of the blue" in italics, though he was not originally in italics. Could not discover whether and how to adjust it. What is also a bit annoying me, that is always displayed at the bottom edge, how many minutes you are still for the current chapter braucht.Aber the course subjective, others may find that even well ;-)
All in all a good thing.