This product and the collection they (1-5 and 6-9) came from is by far the best blank dungeon resource out there for a GM who wants to run a homebrew dungeon, has ideas for encounters, npc's etc... but lacks the time for something proper. The best part about this is that it doesn't try to be a new tileset, nor give you thirty different formats to choose from.
Using these with a tablet is awesome and of course they print out great as well. For $0.50 a map, you're doing yourself a disservice if you need mini's scale dungeons and don't pick both 2-5 and 6-9 up. I bought the first book then squealed after seeing these in proper battle map size.
I hope CSP keeps releasing these products, as I know that I'll cheerfully keep buying them!