Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worst search ftn & very very difficult to browse books or chapters.

Very good contents but worst ebook format/funtions make me very disappointed & frustrated. They need to learn from ESV ebook bible.* Map is not scalable. The small size map is hard to read in ebook reader.* Main Table of content does not contain list of books/ chapters. So you should spend time to find the list of books/chapters in the middle of books. (Very inconvinient)* Very slow/inefficient search funtion* Browse funtion is not good. Hard to move back & forth between books/chapters.