I use it to read e-books, articles from online sites etc., as well has technical documentation for my work projects. It's very fast in loading pages with different fonts sizes (espcially when using zoom), no extra toolbars or menus are needed once installed so I don't have any complaints about its layout and design of this program itself either. The only problem which I face right now is sometimes I need more space at screen resolution 1280x800 but I can move scroll bar up/down, left/right by clicking mouse buttons and make some more room if necessary. Also there might be other applications out there with similar features like mine, however they may lack functionality with bookmarks, page numbers etc. You will not regret having this application running. As far as reading eBooks goes - nothing much else could really help me since all books are stored offline already anyway.