When I read Silman's book: "The armatures mind" I was disappointed, in fact I did not think much of this book; this naturally put me off ordering the book: "How to reassess your chess."
I took the gamble, and it paid off. This is a first class book and good value for your money, for the amount of information contained in this book.
Jeremy Silman has a good sense of humour through out his writing.
I do agree with one of the pervious comments that some sample games did leave me a bit cold, also I found a lot of deviations in the book, you are working your way through a game and there is the same game which can have a different out-come.
Having said that; the information is there should you require it.
There are plenty of test; too many in my opinion. As I worked my way through the book, I ended up only doing some of the test; they are too time consuming, but they do ram the point home; if that is what you want, that's a bonus?
One warning I must give: this book takes a long time to work your way through, so don't expect just a few weeks read, it has taken me months, it's hard work, but the results are worth it; definitely a chess book to keep on the shelf for future reference.