This is a fantastic book. An easy read about how with the help of techniques mentioned in this boo,k one can improve their way of thinking.
Personally speaking, this is one of my favourites and is part of the book which I will have to revisit every so often. The others being The 7 habits of highly effective people by Stephen Covey and How to win friends and influence people by Dale Carnegie.
Although it is an easy read, what the authors ask of you is counterintuitive, and hence the book will need re-reads and the techniques described will require practice before you see any results.