Bondage and S&M toys have to have a certain aesthetic appeal for me, as well as functionality. I think the main problem with this book is that, yes, if you are good with tools you can make these things, but they won't be nearly as attractive as professionally made items. Some of the things, like a bubble-wrap dildo, are just hideous and tacky. If you are a fetish who loves the mood and psychological effect that polished leather and refined, beautiful instruments of torture create, you probably won't be happy with the majority of the things in the book. PVC and duct tape just isn't as sexy.
Of course, the advantages are the cheapness of the toys that you can make yourself. I would only recommend this book if you are VERY much in need of inexpensive toys, or are an expert craftsman. For most other people, save your pennies and visit jtstockroom.com and get some beautiful and well-made toys. (I don't work there, but I don't mind advertising for them, because the items I've gotten from them are the finest I've seen anywhere.)