I've been working in and traveling to Madagascar for more than 6 years, and I like to keep up on the guidebooks that are available as in my free time I enjoy traveling around the island. This edition sort of gets the whole picture but when it comes to details is off in many places (even the maps, protected areas in the wrong spot, roads not entirely accurate, etc.)
Additionally, recommendations are made that are very questionable, especially for the average traveler. Go by car from Sambava to Ambilobe? Really? That is a 18-24 hour taxi-brousse ride if you are lucky and there is a descent chance you will be stuck for days if a truck has tipped over or gotten stuck in the mud. And this is one of the 3 recommended itineraries? Also, there is an over emphasis on visiting Andringitra. Yes, it is beautiful, and yes it is under-visited and not given enough attention in the other guide books, but the way this book sells it is just wrong, though I guess that is more a matter of opinion and taste.
Then there is the price. $28 is insane for this little book filled with poor recommendations and hit and miss information. On the plus side, it is organized well and if you are already familiar with the Lonely Planet series then it would be easy to use this one (which is why I gave it 2 stars instead of 1).
Instead of this book, I would strongly recommend
Madagascar Travel Pack, 3rd (Globetrotter Travel Packs) It's less than half the price, recent (2011), and accurate, with descent recommendations and solid information.
If you like it more personalized with a narrative the one by Sara LeHoullier Madagascar (Travel Companion) is solid, and while a lot is missing from this book you know it ahead of time before you buy it (it's a "Travel Companion" to accompany other books!)
If you will be in country for several months, you probably should instead or in addition to the other two above, go with the Madagascar, 9th (Bradt Travel Guide), which is as thorough as it gets and largely accurate, at least compared to this Lonely Planet one. If you're going to pay $28 for a travel guide it may as well be the Bradt one!!!!