Great book, very informative and detailed. I haven't yet found another really good moth ID book for N. America. It's even harder to find a complete guide for moth and/or butterfly caterpillars. This book is a wonderful resource for any budding moth (or butterfly) lover. It has a lot of information on classification, food plants, life cycle, behavior, and even techniques for surveying specimens that would be easy to implement in your own back yard, local woods, etc!
Regarding this book, if this is your only source for ID: The photographs can be super hard to navigate and use for identification because of the age of the photography used. The colors and details are often washed out and can be unclear or misleading. It is nice to see the size difference and comparison between species that this method of photography offers, but it would be much more usable if the images were up to date and (individually organized by species) with all the glorious technology now available!
I used this book throughout 2022 for IDing as a hobby but did need to combine it with other resources. Using this book alone for ID was a very time-consuming task, and I do not recommend doing it that way. This book became a much better resource after I shifted to using this book as a starting point for ID. I combined this book with the iNaturalist app most of the time.
This book is not a huge resource for moth caterpillar ID.