I compared the price of this e-book in different sites, and I ended up paying $20 more than another site. For some reason, I missed the other site. But, what I like about it, is that I was able to read it that same day (I had homework to do ASAP). It reads out loud the pages, which help me out a lot. I wish the book could be more accessible in the sense that I don't have to go back to the index, click on the chapter, then on the section, read the question I am working on, then, go back to the index, click on the appendix to compare my answer to the answer section. It's time consuming. If I scroll up, it takes me to different chapters, but it does not give me the access to go directly where I want. The flash cards are so tiny that I cannot see them. If I press Ctrl-F to find a key word, it does not take it. The e-book is not accessible to move around.