Invaluable primer on Demark indicators
This book provides the clearest exposition of Tom Demark's work that I have seen, explaining both how to implement the indicators and giving suggestions for interpreting them as a discretionary trader or as part of a mechnical system.

It is written from the perspective of a practitioner and targets that audience - Jason has been extremely generous in disclosing many tricks of the trade in applying the indicators that one otherwise could only learn painfully from watching several years of market behaviour under different regimes. For example, he explains how a trend-follower can use TD Setups in combination with TDST lines - an idea not explained elsewhere.

Jason Perl is the expert on the application of TD Wave (Tom Demark's rigorous variation of Elliott Wave), and the explanation of how to use this tool in combination with other indicators is on its own worth a multiple of the price of the book.

Descriptions but no explainations
This book is excellent if you want to know how to construct the DeMark indicators. It tells you all the parameters and goes into all the subtleties. However, if you are buying this book to write a black box it doesn't give you a full trading strategy. The reason for this is it allocates very little time on exit strategy - 95% of the book is on entry. Additionally there is no description as to how the default parameters have been decided. (The 9 and 13 particularly - they are just assumed from page one.) However, as I have said, if you are looking for a book that clearly explains the entry techniques that DeMark uses this is for you.

Essential Reference
For years I've been trading using Tom DeMark's indicators, I have produced my implementations of TDSequential, TDCombo, TDST ( In QuoteTracker, Worden Blocks e.t.c). It was a very long "trial and errors" process.
DeMark's works have lots of haters who have difficult time to admit that something that "simple" could (if interpreted correctly) produce such steady trading profits in ANY kind of market.
When I saw this book appeared on Amazon - I ordered it right away, just needed to see what it had to offer ( so little info on DeMArk for retail full time traders)
I wish I had that book when I was coding DeMark indicators - it would save me lots of time - this book is a "MUST READ" for anyone who is a serious trader, it sorts and logically arranges what was scattered across the pages of DeMark's own books. THANK YOU!
DavidDT of trading-to-win

An Essential Guide to TD Indicators
I've been struggling for weeks now to recreate many of Demark's indicators for the Ninjatrader platform in C# - relying soley on the original explainations in Tom Demark's book. There are a lot of very detailed logic rules for these indicators that , if you blink, you'll miss a step in the procedure. Jason Perl's book is exactly what I have been looking for.
He breaks down each indicator in a top down pseudo code step by step format that makes understanding and code translation a breeze. There are also numerous Q & A's that I found extremely insighful.
HIGHLY RECOMMENDED!