This is a good starter for those who are interested in learning how to knit on circular needles or for more experienced knitters who want to explore the intricacies of circular knitting. Patterns and techniques are laid our clearly and are easy to follow. There are a lot of photos for each technique as well. The projects are helpful in learning new techniques. in real time. There's also a helpful section on how to convert a flat pattern to circular knitting. 

I was already pretty familiar with circular knitting before this book so I didn't come away with any new revelations but I did learn a few new things. I definitely think that this would be a good reference book for those who love technique and would also be great as a primer for those newer to circular knitting.