While the content is excelent and knowledgeable the functionality of highlighting, commenting and managing text size, font, etc does not exist in this ebook reducing the relevence and usefullness. You are able to zoom in on mobile devices but when viewing on laptop or desktop you are unable to zoom in to enlarge the text for reading.

It is hared to justify the price of this ebook compared to the printed version. You are unable to highlight, lookup/define, comment, notate any of the content like you would with a printed version. If this is to be used as curriculum for testing, the book needs to allow reader interaction. Only benefit is the ability to sync last page read on multiple devices.