I read this for the spatial modeling & GIS methods used for the Mannahatta project. In that regard, I was rewarded w/ rich detail & well-made, beautifully mapped, intensely researched work recreating the historic landscapes, hydrography, topography, habitats, soil types, & species distributions of Manhattan island in 1609. He describes the processes step-by-step of the models he wrote & the layers he overlaid, making his methods very applicable not just for his Mannahatta project, but for other scientists hoping to do similar work in other locations.
What I did not like was his ridiculous assumptions of what Manhattan will be in 2409. He assumes that New Yorkers can have their cake and eat it too, w/o personal sacrifice, much in the same way that people are living now. With the global context of resource exploitation, habitat degradation, climate change, & overpopulation that the world is dealing w/ now, this is unrealistic.