More a 3.5 than 4.0 :)
Looking at this book from a purely objective artistic viewpoint, this is a good book as an instructional guide to using Manga Studio 3.0/4.0. Aside from the tutorial on how to use Manga Studio to achieve certain affects, it also covers some basics of the concept of "Manga". Manga as the comic book form of east asian cultures, and more specifically, the black and white variant.
The book also covers some comic book pre-press basics as well as pitching your work to various comic book publications, which isn't something new to me, but what I consider more helpful and informative than the "how to manga" or "how to with Manga Studio" aspects.
This is not a "how to draw" book, but a how to create manga using Manga Studio book, and in this sense, it does a decent job. I tested this on the Manga Studio 3.0 EX Demo provided on disc with the book. I am not sure how much more indepth a guide to the software could be, but in my opinion Manga Studio (the version I tested) was not all that intuitive.
I have provided some examples of what Manga Studio does. I took the short route because I work full time (a blessing these days) and am only showing how Manga Studio "manga-nizes" an imported image. The image is something I did and painted digitally with a type of watercolor effect and then imported into Manga Studio. As noted, the book does come with a $100 off Manga Studio EX coupon, however, it seems to be only usable at Smith Micro's website and not here via Amazon.
As for the manga aspect of things, "manga" would allow the aspiring artist to publish their work in a more economical fashion, yet still not skimp on some of the visual impact all that much.
Just keep in mind, "manga" is a style but be original and genuine. The provided images are my work so I don't have to worry about copyrights. ;)