My goal in reading this book was to build on a decent knowledge of molecular biology and statistics to get a basic understanding of the techniques of bioinformatics. This book definitely helped me do that.
The book opens up with a quick review of the relevant aspects of cellular biology and statistics. This might be enough for readers with no knowledge of biology, but I think it's better used as a review. If, for example, you don't know what a nucleotide is or what transcription is, I think you might want to learn that material somewhere else before reading this book. However, others may disagree.
The topics discussed were relevant and interesting. They include gene finding, sequence alignment, Hidden Markov Models (my first exposure to this topic), some applications to evolutions such as phylogeny, whole genome screening, regulatory sequences and gene expression. I found the quality to be uniformly very good. Many calculations were done in detail.
Most of the book deals with basic principles, but as the title implies it uses specific case studies to illustrate the theory. In addition to providing examples of how to apply the theory, the case studies were interesting in their own right. A couple of my favorites were calculating the genetic distance between Neanderthal and modern humans and how gene expression is important in wine making.
While the emphasis is on learning the fundamental concepts a few tools/resources were briefly mentioned including BLAST, FASTA format, GenBank, PAM and BLOSUM. However the coverage of these is minimal. If you're looking for a book on existing bioinformatics tools like BLAST then this book probably wouldn't be a good choice (for that I thought "Bioinformatics, A Practical Guide to the Analysis of Genes and Proteins" by Baxevanis and Ouellette, was pretty good)
One kind of odd thing (odd in my experience anyway) is that when describing matrices a (column, row) notation was used, for example on page 43 a matrix with 2 rows and c columns was described as a cx2 matrix.
I think this book provided a very good introduction to a fairly wide variety of concepts in bioinformatics. If you have studied these topics previously this book might be fun to read, but you probably wouldn't learn much (except perhaps from the case studies).