Just finished reading this book and have to agree that while extremely overpriced, there are some interesting applications of Wilder's Directional Movement that deserve further research.
First, a big Caveat Emptor regarding the six 'strategies' the author details in the book. While the author states that all of these strategies will find "low risk, high probability entries into trending stocks," there is no discussion on how he came to select the periods he uses for DMI and ADX, the rules for each 'strategy,' and most importantly, a complete absence of performance testing to quantify and substantiate his claim of low risk and high probability.
However, he did go to the effort to trademark their names which, as with the book's title, is a trite derivation of ADX...
If you're considering buying it and can't find a used copy there are only two options that I found, traderspress.com and the author's website. Shipping charges are reasonable with the former and beyond absurd through the latter.