The presentation is slick. The photographs look great. Your co-author is amazing at what he does.
However, I wouldn't buy this mainly for 2 reasons. The first is the endorsements. No one in the endorsements section has written books or articles on body language. It's pretty much young kids and college students saying how much they liked it. It would probably be a good idea to get some authors of other body language books to write some reviews for you (because if your book is worth the money, it shouldn't be too hard to get someone who knows what they're talking about to say you know what you're talking about, right?) That, and none of the press is real press (of the three links one is from some college student, one is a press release, and the other is a link to your blog. So 2 of the 3 links are authored by you.)
Secondly, you doesn't seem to be an expert on the issue (no offense, because I'm sure you know a lot about it, but a book on body language is something I want written by a guy with an advanced degree in psychology who has done lots of scientific field work and is published in journals. Why read an e-book written by a guy who has read the other books when I can just go out and read those other books on my own, right?).
I'm sure you've read a lot about the subject, but when you read Dr. David Givens you know that this guy has done scientific experiments (and I can get his classic "Love Signals" for a dollar online plus shipping, and get an actual book, not an e-book). I'm not saying you haven't necessarily done the field work, but I guess I just trust a guy with his doctorate in psychology more than a guy with a bachelors in bio (like how I'd buy a book on philosophy written by a guy who a doctorate in philosophy instead of a guy with a bachelors in sociology). Now, his presentation is nowhere near as slick and easy to use as this.
To be fair I generally mistrust e-books in the first place, though (like a band that instantly gets more credibility when they are signed to a major label, a book put out by a major publishing house has credibility that an e-book lacks by virtue of being an e-book).
Anyhow, good luck with the thing. I'm sure it will do well in the PUA community.