A very large percentage of books are for children. A further large group are free books from the public domain and therfore free. Downloading is dificult and slow. Many true books have been devided in up to 4 parts that must be downloaded separately. If you want to go to a page near the end you have to open and advance 2 pages at a time very time-consuming if you want page 70. They have produced a variety of covers and use them to present short articals as books. User's recommendation: Use cautuing and consider the abouve features.