Just about every villain has a showdown in his tower lair, but there are surprisingly few tower maps. This is partially due to the fact that there's simply not a lot of room for a map. Towers tend to be spiral death traps. The other problem is that they're not very interesting for cartographers. Fortunately, Ed is up to the task.
I bought this set for use with the Freeport series and it performed well. The biggest problem in matching a tower map to an adventure is the entrance and exit between each level. Some characters will climb the steps, others will clamber up and down ladders, still others will pop up through trap doors, and the high level guys fly through the windows. Despite the fact that towers aren't necessarily all that exciting in their presentation, there's actually quite a bit of variance in how players might interact with them.
This means that tower maps tend towards a specific function. Ed's map features a wizard's tower, which is probably the only tower anybody's interested in. It features cockatrices at the entrance, animal cages (for guardian monsters, natch), a balcony, stairwell, lounge and balcony, summoning and scrying chambers, alchemy lab, library, bedrooms for the wizard and his minions, and a study. The tower segments are divided into quadrants which allow limited mixing and matching; the dungeon segments are different from the rest of the tower.
Overall this is an excellent set, but it's also very specific to a wizard's tower. It's easier to build an encounter around the maps than use it for a published adventure.