I just got the book and in short, was very impressed. The book fills in the gap in the taxonomic order not covered in the famous Birds of South America Vol. I & II by Ridgely and Tudor. The book is small and compact (5" X 7.5"). The illustrations are great...a bit crowded on some pages (as can be expected with the size), but overall are visually appealing and birds are identifiable (unlike other Princeton Illustrated Checklists I've seen recently). The book is just that though, an illustrated checklist. Each bird is illustrated on one side with a corresponding paragraph describing the bird and habitat on the opposite side. Each species has a small range map next to the text block as well.
The only errors I've seen so far is that some birds are do not have a numerical label, matching their illustration with their name/description on the other page. These are few in occurrence and don't pose too much of a problem, but obviously overlooked by the editors. One other thing, some of the birds, particularly some of the hummingbirds, have been painted as you may see them in a shaded forest (without any iridescence)...thank God the Velvet-purple Coronet doesn't always look like that!
Overall, this is a great book to add to your collection or to use in the field if that sort of thing is lacking where your going. Its a bargain and recommended.