I've read a significant amount of JW literature, and to be honest, Rutherford's work stands out the best. Although he wrote horrible books such as Riches, most of the better JW literature I've read come from him, too. Preservation is probably his best work, but Deliverance and this book aren't that far behind. It introduces people to the JW faith, and isn't as heavy-handed as a lot of later JW literature.