I am about 1/3 of the way through reading this book and I cannot say enough good things about it.
I asked for it and received it for my birthday a couple weeks ago, and just now picked it up. I can't believe I am even taking this little bit of time away from reading to type to you guys since I'm so engrossed by the book...but I just thought I'd share because I'm actually bummed at myself for not reading it 2 weeks ago!
nothing in there is revolutionary, it's just so concise and well explained and logically organized. It basically takes all of what we are trying to accomplish on this forum and boils it down to a few key concepts you need to solve for in each situation. I know poker is a very vast and complex topic, but for my money Harrington presents it in the style that is most "easily digestible" and "usable, practical advice"
and while I say it is concise, it is a 479 page book (that I am only 150 pages into) but it's as concise as it can possibly be while being extremely helpful and practical.
just do yourself a favor and spend the $35 or whatever on amazon.
fyi: I have absolutely no affiliation with action dan or his publisher. just a fan and avid poker reader here.