Hi Nathan,
I was following the release of this book and will probably buy it shortly. I think the reason that a lot of people are being so critical is that it's UX. I work in UX and everyone is (or thinks they are) a UX "designer". I looked at your sample pages and web site and thought I could learn some things from you. I also thought it looked great, so I don't think you have anything to worry about.
No one is going to do things exactly the same and your book doesn't come-off as being a forceful entity on rulesets, which is nice.
I would also like to see some other pricing options - mostly because I want the book and PSDs only, but I don't see anything wrong with your pricing model. It scared me at first but I didn't see/notice all of the extras that you had for sale with the book.
Anyhow, good luck, I can tell you spent a lot of time putting the material together. This is a tough crowd but in the end most criticism, even if harsh, will hopefully be constructive.
Enjoy the sales and focus on the real UX designers/developers ;)