I think e-book is very convinient tool. Especially, it is appealing that we can go to school without many heavy textbooks. In addition, if we use e-book, we don't forget textbooks. Because every textbooks is in your e-book. So, e-book is very useful for students. However, this is just my personal opinion, but I don't like reading letter on screen. Because reading on screen ruin our eyes. So, I know that e-book is very useful tools, but I don't think that e-books become used everyone so easily.