content: Took a class to become a Class 1 Florida Home Rater. This book was given to every student in the class. It seems to have quality information that is put in a simple format to read.Before I took the National RESNET test(passed), I highlighted and tab the book which was very useful come test time. I also bought the Online version and up it to my web site so I could use adobe search at test time.I found the online book not to be as beneficial because I was faster using my tabs. So I would recommend the Soft book version over the Online Adobe version. I think you learn more by highlighting and tabbing an actual book too.If you plan to take the National RESNET Test then this book is a must to have.