I really like this book for many reasons:

First it is about Perl and how to make most out of Perl. Perl 5 has been blessed with some great additions in CPAN, which are not covered in most other Perl books (at least not in those I read so far). This book explains those additions and some concepts behind them. It is interesting and informative.

Second it was written in the true Perl spirit which is in the open, i.e., you could go to the books website and get the chapters still in draft. So there is feedback and improvement already in this first edition. With other books you have to wait for the second edition to have those things.

Third it shows that Perl 5 is not an old-fashioned language that cannot compete with the new hip languages, but Perl 5 still has a future. You just have to write the right kind of Perl code and the book explains how to do this.

In summary, if you like Perl 5, I'd say you will like this book.

Modern Perl