The authors are long-time professional Perl trainers and it clearly shows: the selection of material, organization and presentation style are honed and distilled to be worth paying for hourly. The book is well-balanced beteween theory and practice being divided into several thematical chapters each starting with a short intoduction followed by concrete receipes, accompanied with examples. It's also very usable as a reference as receipes are clearly named and easy to find.
If you got a basic hang of Perl and are starting to love it, get this book now. This is a rare one, teaching Perl beyond syntax and common module usage.