Creative Clay Jewelry is one of the many books that attempt to cover polymer clay work from the very basics to quite advanced. While other books are probably more successful at that (Sue Heaser's Polymer Clay Techniques Book, for example), Creative Clay Jewelry has some good projects and solid information, and would be quite useful to the beginning to intermediate clayer.
It's unfortunate that there's no real indication of level of difficulty in the projects; they don't follow any logical progression. Some of the early projects use very basic techniques only - jelly rolls, marbling - which could probably be discussed in the introduction section. However, just a few projects in, there's a geometric pattern that would be quite difficult and frustrating to do as your third or fourth PC project. I'd advise careful consideration when selecting a project from this book.
Dierks does provide a much more detailed ingredient list, including things like findings and clay amounts, which other books tend to skip. She even specifies particular brands and colors, but it isn't necessary to adhere to them.
On a more personal note, I got less use out of this book than most of my PC books, simply because the projects were very bright, busy, and colorful - and that's very far from my style. But for those who love the casual, cheerful look that polymer clay can provide, this book might well be great.