My husband and I spent 3 weeks traveling around Brazil. Maceió, Salvador, Rio, Blumeneau, and Foz de Iguau (Iguazu Falls). We used a travel agent who was from Brazil to book our hotels and flights in advance, but as far as local travel (and in one case, arriving in an airport an hour from our destination city, Blumeneau), we found this book indispensable. For example, it clearly explains how the bus systems work and why you should take them. It also have info in Rio about an airport bus that saved us at least $25, if I remember correctly, in not taking a cab. Recapped the cost of the book right there. Most often, and in spite of my being able to converse in Portuguese, the book was more helpful even than the hotel staff of the hotels where we stayed.
As an earlier reviewer mentioned, prices are completely out of date, due to currency fluctuations, and I agree that listing them in the local currency would have been helpful. Still, since the exchange rate the prices are based on was also posted in the book, it is possible to recreate that information.
As is inevitable with any travel book, some smaller restaurants have closed since publication, and we often relied on locals to give us recommendations (sometimes those recommendations were also in the book, though!). Ditto on a laundry place in Rio. ;) Overall, though, the recommendations in the book allow a tourist to navigate the city without feeling lost and out of place. At least, it did that for us. We used it so extensively that the cover is going in our scrapbook, having been such an integral part of our journey.