Good, with some problems

A very nice reader with a clean interface.
Pros:
Easy bookmarking
System brightness swipe control
Font type and size selection
Margin/spacing selection
Cons:
No landscape mode. Really?!
No "Define" option when selecting a word
Crashes frequently (almost every time) when trying to select a word
Sadly, lack of landscape and define are deal breakers for me. Otherwise, a very nice reader indeed.

eyv about YiBook pro - epub txt reader