If you have a keen interest in dinosaurs, it’s most likely this “rediscovery” will hold no surprises for you, though it’s still fun as a synthesis of recent knowledge and understanding about dinosaurs. It’s also a beautiful object, with colour reproductions of dinosaurs and our best understanding of what they looked like, and other helpful illustrations.
There’s not much to say about it, really, beyond that: it provides good explanations of how we know what we know, edges toward the speculative at times, and generally is a paean to science and the way we are beginning to be able to test hypotheses that just had to kind of stand.
(One example being, of course, that we now know what colour some dinosaurs were, due to examination of the shapes and types of cells in their remains.)
Entertaining, and possibly worth keeping around just to be a reference work on dinosaurs, but not surprising. Unless you’re about ten years behind and need an update, in which case I’m sure it serves admirably!