Lots of issues
Using this on an iPad Mini with retna has been a frustrating experience.
for some reason books just refuse to download, the download icon animates but the progress just never seems to update. I have to fight with the app, close it and reopen it multiple times to finally get it do download anything.
When i try to highlight a word to define it or select it the app will just crash randomly. When I try to bookmark a page the app will just crash, or it will not place the book mark until I close and reopen the app.
Uploading books to google play is really easy, and the books do show up in my library but downloading these books to read them puts me through the same frustration as downloading books that I have purchased.
Tekuzo about
Google Play Books - Books & Comics, v2.5