The book is interesting as it not limited to memory techniques but ventures to mathe-magic tricks as bar games, and starts with optical illusions. Though, to me, they are no way linked to the memory techniques, they do provide a nice break from the monotony of the lists and numbers.
For the uninitiated, who has never heard of even the palace technique, this book offers many methods which could be utilized to remember basic things. However, majority of the techniques are well known and the book falls short of offering anything new. The detailed explanation is good for a novice reader but becomes monotonous to someone with more experience.
Dhaval ends the book with his personal 10 commandments, which felt completely unnecessary to drive home the point that while strong memory is good to have, there is no substitute of keeping a backup.
Read it once as a breeze, and make notes for certain formulate, like calculating days, etc.