I've recently purchased his Reactive Training Manual and am really glad I did. I've been implementing the info from the manual for the past month or so and definitely see myself continuing to do so for the foreseeable future.
The manual is pretty cool in that each chapter is a step towards making your training better suited for yourself. So far the main thing I've learned and am drawn to is the objectivity towards judging how hard a lift is (rate of perceived exertion) and managing stress. But I suppose the number crunching and objectivity appeals to the science and math nerd that I am.