Not a good app
I normally really like Google products, but this is an exception. I bought my biology textbook from Google Play because it was the cheapest place, but I very much regret it. The highlighting is very difficult to use even when it does work. The page-turning improved with the new update, but it is still temperamental and I often have to swipe several times in order to turn the page. Additionally, it may only be my book, but it is very hard to navigate because the page numbers printed in the book do not line up with the ones on the scroll bar. Overall, I would not recommend buying books from Google Play to read on an iPad.
R3S2U about
Google Play Books - Books & Comics