As a English book app, without a doubt this would get a 5 stars rating from me. However, I am rating this as a Chinese books app, and I find this falls short on a few levels. The search function drives me crazy! And the Chinese book categorisation does not make for efficient browsing. So I am giving this a 3 stars app.
As I mentioned earlier, if you are reading to your children in both English and Chinese, this is an super economical app. This a very straightforward, old school style digital library. There are no Chinese audio books, read-to-me books, or interactive books. If that is what you are looking for, Get Epic will serve you very well.
Otherwise, I would recommend you look at Ella books, Kada Books, Wawayaya Readers and Hyread for Chinese only digital books.