This book was as interesting as any other biography could be, however, the authors did manage to use a very nice and flowing format. Organized from point to point, never spanning more than three pages, and following in chronological order from Leonardo's illegitimate birth to his ordinary death, the books writing style is very easy to follow and is easy to pick up at any spot.
Priwer and Phillip's book is very informative, and anyone looking for research information about Da Vinci would likely consider this a Holy Grail with its factual yet interesting points. On an overall reading scale, however, for anyone simply looking for good read, this book would probably not suit as well (unless the reader has a terrible Leonardo fetish).
In the end, this book is great for someone more interested in facts rather than an interesting story line. Another strong point of the book is that it suits readers of all ages because of its easy to follow format. I would have to rate this book as a 3, don't be afraid to check it out, it's not bad!