I have enjoyed many of the recipes in this book. It has more lamb recipes than you'd usually find, which is wonderful for people who love lamb stews, etc.
I do find myself altering each recipe to my own individual tastes and ideas, so, after using the first couple of recipes, I'm not so sure I NEED the book any more --- slow cooking is a rather broad skill, and precise measurements are usually not needed.
So if you are a decent cook, this book may not be for you. If you are a beginner cook or have never worked with a slow cooker before, an investment in this book might be worth it.
Experienced slow cooker cooks could browse this book on the shelf, get the general idea, and not spend the money.