Unlike the earlier Adventure Path map folios, this one is just three poster maps of the three major encounter areas. Which isn't very helpful if you're looking for battlemaps.
They are, however, beautiful, filled with all sorts of details. And they're huge, 22" x 33", so that detail is clear. And there's a lot of it. Since these are the three big sandbox locations in the Path, I think the map folio is well worth it just to illustrate the locations for the players. Gives them a good sense of scale, putting "an island" or "a city" into perspective. (They don't have any keyed locations noted on them, which makes them perfect for a player aid.)
The first is the island of Smuggler's Shiv, which is really nice but pretty barren---it's all just wilderness, trails, and beach. Which is good because it doesn't give anything away, but bad because it shows where all the trails and mountains and stuff are, which takes away from the exploration bit. These small issues are the only reason it doesn't get five stars from me.
The second are impressive urban landscapes from cities later on in the adventure path, Saventh-Yhi and Ilmurea, which are stunning. If you're running this path, and are going to do a lot with modules 3 and 5, this folio will be a great asset. It's a great eagle's-eye view of the cities, rich with detail---tons of buildings, terrain, geographical features. Lots of locales for the PCs to go adventuring; as sandbox cities, the folio's a great help.
I found that this folio has a lot more utility than other map folios I've bought: I can actually show them to the players, and they're of locations I'll be using for more than a night or two. (My group spent over a month on the Shiv.) Then again, I really like big location maps; if you want battlemaps for miniatures use, you'd be better off getting GameMastery Map Pack: Jungle or something similar.