I used the pieces in level one of my "Down Among the Dead Men" D&D Megadungeon campaign, and they worked pretty well. You can't do super-elaborate layouts with the pieces, but it's only the first phase.
|One possible configuration|
- Two 20' by 20' rooms, one with two doors on opposite sides and the other with two doors on two adjacent sides
- Four 15' hallway pieces
- Four additional corner pieces
- Six 10' hallway pieces
- Two 30' by 30' rooms
- Six modular doors
I've already begun building the Phase 2 pieces, so updates should be forthcoming.