I have to admit, my book just arrived yesterday. Therefore, my current review is not based on content quality but on ease of use. The text type and font size for the graphics (icons, charts, nspire keyboard illustrations) is both extremely small (teeny tiny icons)and often faint in color. This makes for very difficult reading. The screen shots of the calculator are often tough to read because of the size of the text and the shading they chose. You will have to read this in a well-lit room to avoid squinting at the graphics, icons, and equations.
Having said this, I would still purchase the book to be able to use the Nspire calculator. If you know what you want to do, it seems to have the detailed explanations to walk you through the steps. Also, it does cover both the CAS version of the calculator and the TI-84 version.