The editor is awesome, but the ability to export the rule set to decorate random maps is (for me at least) the big feature. We use a Lua based engine, Solar2D. and I can see this being a very nice improvement to the work flow from some of our past projects.
I bought it, exported a sample rule set to Lua and it generated an easy to follow set of if/then conditions. I've built those by hand before and it's not fun.
Next experiment is to run it through the maze generators in rotLua and decorate some rogue-like maps :)