This is GREAT as a supplement to the physical book. The book is a unique and insightful reference to interesting physiology and nutrition research that I haven't seen summarized together in any other place.
If you want to actually read the research you also need a written version of the book to see the 200+ citations, so I bought the paperback as well.
The book strongly promotes Jaquish's X3 product, but for me this did not detract from the knowledge gained (however, looking around online it seems a few people are very upset by this).
The narrator pronounces Dr. Jaquish's name differently at different times in the book, which I would expect to have been fixed before publishing...