Although the other reviewers are correct in stating most of this material is repetition from other books, it still deserves 5 stars, easily.
This is likely now the best intro to Mantak Chia's work.
Why is this material incredibly valuable?
-The inner smile is an incredible exercise for improving health
-The benefits can be felt almost immediately!
-It is one of the quickest ways I know to turn your attitude around
-Although Mantak Chia describes tons of Taoist energy exercises in his books, I feel that the Inner Smile is by far the most important one
-The Inner Smile is incredibly easy... virtually everyone gets great results right away.
I enjoy playing with a lot of different meditations... but when I have trouble, it usually only takes a few minutes of the Inner Smile to get me focused, relaxed, and happy again.
In addition, repetition is required for learning. If you read about a meditation, and practice it for a while, it is very valuable to go back and read it again. You will likely learn something new everytime, as your perspective will continue to change from your consistent practice. Having it in another book just gives you another reason to study the material again.
I still have tough days from time to time... this implies to me that I have more to learn/understand/integrate about the Inner Smile, even though I feel it has been of tremendous benefit already.
If you aren't familiar with this exercise... Get This Book! If you are familiar with it, and you practice regularly... then you probably don't need it... but I'm more than happy to spend $10 to support the guy who introduced me to this.
keep smiling,
Benjamin