The last 90 pages of the book are text descriptions at about the level of the Howell and Dunn Gulls book. They're not as technical as the Olsen and Larsson Gulls of North America, Europe, and Asia book or the Wheeler Raptors book. Each account begins with few paragraphs vaguely channeling a Pete Dunne essay that introduce the species, some are told first person from the bird's perspective, some are told in the 3rd person about the bird, and some are from the birder's perspective. Personally I would have kept the voice more constant but it's a minor point. There is an excellent prose description of the bird's flight style. I don't know that any book is going to be able to approach the venerable Dunne Sibley and Sutton Hawks in Flight in that regard, but these are very readable.
The other criticism I have of the book is that it includes only the regularly occurring species. While I know the line has to be drawn somewhere (there's little reason to include some of the relatively random single North American Red-footed Falcon or Collared (?) Forest-falcon records), but I would have included semi-regular birds like the 2 rare sea eagles or Hobby Falcon. Having been lucky enough to recently see the Lesser Sand-plover I was grateful that this species (as well as Greater) was included in the Obrien Crossley and Karlson Shorebird guide (which incidentally is the only other book on my shelf that presents a good number of birds as unknowns).
I would recommend this book. I don't know that I would use it as a field guide, there's not a lot of easy direct comparisons species to species, but it will help a person get a better feel for the birds so that if studied, you will need it a book in the field a lot less.
I think I'm going to start buying lottery tickets, it'd be a ton of fun to create the neo-tropical counterparts to these books.