What can I say? I just love Heroic Maps!
But here's what you need to know:
(1) Heroic maps were intended for use in games that make use of modular dungeon terrain... think mapsheet with miniature furniture, scenery, and figures. Therefore the maps almost never include any decorations. (This is an awesome way to play, by the way, and you can get papercraft furniture and scenery fairly cheaply if you dont have any yet).
(2) That being said, the lack of furniture means the designers could focus on the map itself, and that's exactly what they did. They are beautiful. These aren't some JPEG-with-a-grid maps (grids are optional by the way) that dont line up, leaving you guessing about whether your figures are balanced on the ledge of a roof or falling to a smashing death, or whether they are inside that room, outside in the hallway, or using their Pass Through Rock spell to become part of the wall.
(3) Most, if not all, of the Heroic Maps are totally modular - meaning you can link them together and make bigger and bigger maps. The modular dungeon tiles are handy when maps don't line up exactly.
My only complaint about the maps is how they are cut for printing. The maps come as PDFs that are ready to print, but they are somewhat inefficient. The biggest pages print a 5x10 block of map, so if you are using standard letter paper, you are wasting some space. And let's be honest, 110lb cardstock paper isn't cheap.
Overall, some of the best battlemaps I have ever seen.