Total crap

First of all, this app is a piece of crap. Second of all, this app is a piece of crap. It crashes non-stop. And the few rare times it doesnt, it will freeze up and crash within 30 seconds of use. These guys seriously think I will get the paid version? HAAAHAHAH NOT! I should take them to court for emotional distress while using this. Dont bother with this app.
UPDATE
The app will not crash unless you have wireless/3G connection enabled. Apparently when a connection to the internet is available, the app tries to load ads and epicly fails thus crashing. So download your books and disable Internet connectivity, this should prevent crashes. Still one star though.

Dopilsya about uBooks: app for reading books in fb2, epub and other popular ebook formats