I fit the description of the audience of this book perfectly. I understood how to move the pieces, I could look ahead a few moves. I even knew a few of the basic opening patterns. But I was missing the underlying structure.
This book really helped me understand the different roles of each piece. He works through, a piece at a time, and I learned things from each.
I suspect that alone this book isn't perfect. It keeps referring to the importance of Tactics, and I bought it along with the Tactics book in the same series. Together they're formidable, however, and I definitely feel I've improved.
I'd recommend this book to anyone who wants to feel like their beginning to play real chess, rather than moving the pieces around. I suspect for a player who plays regularly this is yesterday's news, but it met my needs perfectly.