I bought this book for our first trip to Costa Rica and learned that this edition is very outdated. After contacting the people we were staying with on the Nicoya Peninsula, and letting them know we've been reading up for our trip, they asked what book we were using - and I told them about this book. They asked what the cover looked like, I said it had a green frog on it, and they said that it is almost identical to the one they bought 9 years ago when they moved to CR.
I immediately put down the book.
I found TripAdvisor and random blogs more helpful - don't waste your money on this edition. I don't know about the others, but this one did not provide much info about where we were and there are TONS of new resorts/restaurants that SHOULD have been listed in this book. It listed some great places...but could use more. Bummer. Had a blast, regardless.