The latest version (1.2.6.3) is really very good, with a working suspend function it would be the everyday reader for me. (I've updated the hungarian translation:
Hungarian.ts,
Hungarian.qm).
Just a note: Page turning speed is a little bit slow on my Kobo Mini - Koreader (using crengine too) is noticeable faster in this regard. However, it's not a dealbreaker, and I beleive optimalisation is the hardest part of development.