"Potential purchasers of this book should be aware of what this is and is not. What it is: it is exactly what the title says- 7 gap strategies with the Tradestation ("TS") code for trading the ES (and TF and EMD). What it is not: anything more than that.
It is just 90 pages- but for me, they are packed with value. The charts (showing minute charts of the ES) and the reports (TS performance reports) are very clear. The description of the strategies is clear.
Do they work? I am not very skilled in TS, but I was able to copy the 2 of most interest to me (Gap Fill-1 and Gap Continuation-1), correct my typos, set up the workspaces, deal with a maxbars problem, and get them working. If you knew my minimal coding ability, you would be impressed!
The reports in the book cover the 5 years before June, 2010. I tested the period after. Gap Fill-1 gave a Net Profit per Trade (NPT) of $54 in the 5 year period used by the book; I got just $15 since. Gap Continuation-1 on the TF gave a NPT of $265 in the book. For me since then, it was $202 (both using the TF). I will start auto-trading this, but just watch the Gap Fill-1 system.
If you use TS, this is a great value for the small price. For me, there was a bonus- it helped in my TS coding skills. It also helped to see how the author developed his ideas. I am sure I will take some of these ideas to help develop and improve my own trading.
What if you don't use TS? Well, you won't be able to try modifications, nor will you be able to try different markets. However, you will be able to manually trade the 7 gap strategies. The entry and exit conditions, including stops, are clearly set out. They are not complicated (except in 1 system). You should make up the cost of the book very quickly.
I am a hard marker- this only the second 5 star review I have given. I have given it 5 stars based on solely its value to me. I hope, though, I have given you enough information to evaluate what its value to you would be.
Update on August 16, 2013: I am on the author's Twitter follower list, and found he updated his results here: [...] In summary, the combo system lost $8k in 2011 but is now at all time highs. It has made about $40k over the last 6 years."