I have owned rice cookers for many years. My latest, the Zojirushi NS-ZAC10, is the best I have ever used. I figured it would be a good idea to branch out from using the rice cooker to cook only rice, so I purchased this highly recommended book.
While the book is very good, and the recipes I have tried so far have all been quite tasty, there is a major consideration that you should be aware of when making many of the recipes in this book: residual odors.
Yes, when you use your rice cooker to make the delicious "creamy breakfast oatmeal" with steel-cut oats, bear in mind that your steamed white rice will smell of cinnamon for at least three or four batches afterwards. My 11-year old (a steamed rice 'purist') noticed the cinnamon 'essence' immediately and complained that 'something was wrong with the rice.'
Similarly with any of the dishes which call for sauteing onions in the rice cooker, or adding other strongly aromatic ingredients. If you use your rice cooker primarily for preparing perfect (and I mean PERFECT) steamed rice, you may not want any other flavors mingling in there.
Just something to keep in mind.
Otherwise, the book is a great resource. There are a few minor inconsistencies (try finding 'congee' in the index), and the resource materials can be a bit confusing (to be fair, the number of rice varieties is quite daunting). And if you are an experienced cook you may get tired of being told the exact procedure for washing rice in every recipe, but all in all, the sheer variety alone is easily worth the price. Also, it is worth noting that if you have a fuzzy logic rice cooker, you will not be able to use it for any of the recipes that employ steaming (which is a fair number of dishes), but you can easily adapt these recipes to any another stovetop steaming setup you may have.
Just remember to plan your rice cooker experiments around your need for 'un-tainted' steamed rice, and you will enjoy "The Ultimate Rice Cooker Cookbook"