This guidebook was a helpful resource as it is compact, summarized and easy to carry in the pocket of travel shorts. It is well designed to help with daily excursions and activities. It is not super effective for overall trip planning, as it doesn't cover lodging/hotels.
For the purpose of carry around excursions, it was good. I would have liked to see a little higher quantity of recommended restaurants and activities...other than that, it was a very effective tool during our trip.
The ultimate test: I will very likely buy more of these for next international vacation in 2011. It was worth the investment.