I've focused mainly on the toolset and playing, but I've given it a go, and it's good once you know the functionality - and most mods will not need DM intervention when they are put together as standalone SP adventures. Where it is useful is:
1. Where you don't know how to script, you can act out whatever you couldn't script using the DM client - just make sure the pizza delivery guy doesn't come at a crucial moment in the adventure;
2. Allows you to make things up on the fly (monsters, treasure, etc) and to possess any NPC (or PC I believe) during the game, so you can talk through them.
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