It's just totally basic. I didn't have any particular expectations, but this book does not contain the kind of detail that a really ambitious home gardener would need. It's very can-do, but like many books that urge readers to "just get started," there's very little in the way of specific technical data to work from. I guess I wanted to know more about the heritability of different kinds of traits, specific facets of plant selection to be attuned to that a normal grower might not be aware of, etc.
This is not that book. If you're a gardener who buys starts from the Home Depot but you want to get in to seed saving, this is probably enough information for you. So that's a 2 in my book. Anyone already saving seeds is probably going to want more information than this.