This guide, which I still prefer to consider as a "first-class" checklist includes 1273 species, all the non-passerine birds from South America (note that not the whole Neotropic region!)
After having the book "Birds of southern South America and Antarctica", I didnt have too much expectation, but now I can tell, they are not on the same level.
This book has an "extra" 33 pages family descreption, which is unusual in books like this. It has infos about behaviour and habit, and some intersting facts too. After come the text and the plates. The illustration are very very good, among the finest for neotropical birds ever published.
Maps are on the same page, but they are extremly small, and only good for overall idea of the birds distribution.
I dont know how good this book in the field, but if you have an interest on South American birds or you just love bird-art, this is a very good choice.