I've had this book for a while now, and have made a few different sausage recipes from it. First off, the book is very good on encouraging readers to try making their own sausages, and it gives a lot of detail on what's involved in the process for various styles of sausage (smoked, loose, dried, links, etc.). The information about dealing with casings was right on the money and very easy to follow--I'm not sure I'd have gotten the good results I have without this particular section. Overall, the instructions are very clear, accurate, and really encouraging and helpful for beginners.
Unfortunately, this is kind of where the good news ends. So far, I've found the recipes to be kind of wanting. They're clever, and it's a comprehensive selection of sausages, but all the ones I've made have been pretty weakly spiced. I'm not talking about them not being hot enough--I like spicy food, but I don't think everything needs to be spicy--I'm talking about not having sufficient quantities of spices. For example, the bratwurst I made from their recipe didn't taste much like anything except meat. This is a fairly subtle sausage at the best of times, but as recommended in the book it's flavorless.
I have consistently found that I need to greatly increase the amount of spices in the sausages beyond what the recipes call for to get a flavor that seems appropriate. I'm a serious and very experienced cook, so I don't think it's a problem on my end. But your mileage may vary.
With that said, though, I still can recommend the book as a good starter into the concepts and techniques of sausage making. Would I buy it again? Maybe not. Will I refer to it again now that I have it? Definitely--on the technical side, it won't steer you wrong, and it's very user-friendly.