The first time I saw this book, I viewed it with a jaundiced eye- after all, Barry is the owner-operator of a travel agency specializing in travel to the Galápagos Islands! Glad I took the time to read it- I've bought every edition since the first!
Barry's book is objective, comprehensive and as up to date as a printed guide can be given that boats are launched and agencies change hands, and includes detailed information on the tour operators, their specializations (e.g. birding, diving, etc.) and even the individual boats. (This is especially valuable- there is no US Coast Guard to assure marine safety in Ecuadórian waters, and the boat you spend a week or more on can make or break the trip- or even you, as more than one boat has sunk or burned.) The book reveals why you can not do the Galápagos justice with a land-based trip, nor in most cases (depending on your trip goals) with a large cruise ship.
You will learn when to go, how to save money to the extent possible, which operators respect the fragile island environment, which ones have university-trained naturalist-guides, which ones do a true seven day trip, vs. those who will take your money for a "seven day trip" and actually put you on a three day trip with a four day trip following (meaning you spend a lot of time in the same places you saw already, not to mention going to port to take on and discharge passengers.) Barry has a dry sense of humor- his slogan is "¡Viva la evolución!"
As someone who has been to "las Islas Encantadas", as the Galápagos islands is often described in Spanish, who is going again in 2003, I highly recommend this book to anyone contemplating traveling there as a key planning tool. I only hope Barry is planning to update his valulable book again SOON!