I bought this to refresh myself and keep as a reference book as I work on a DP ship which like most is diesel electric. I have found that whilst is does cover the basics that one would need as a cadet it lacks greatly when it comes to the new technologies that are commonplace on offshore construction vessels. Little information on vector drives or frequency converters or the problems associated with them.
I also feel that the format and overall feel of the book is old fashioned and more akin to an era since passed. The drawings are very simplistic and there are no manufacturer specific examples from the modern day.
This book is in all fairness relevant in so much as basic power electrical systems are the same, but has largely bypassed the last twenty years.
Given the price and the fact that this book is not exactly a new publication I'd not say that it was value for money. Mind you it's a limited market so I would imagine that anything new will be somewhat rare.