I bought the game solely for the toolset myself.
It has a steep learning curve for sure, and the script language does leave things to be desired compared to the NWN script.
There are no OR conditionals. This hurt me more than most things. You can still make it do whatever you want though. I've done a passage of time system, so have other people. I've done a eating / hunger system, I've done random NPC spawn locations, respawns, and more.
I have a pretty much completed 5-6 hour mod that I'm waiting to release, but I'm waiting on the enhanced edition to build some hype around the game so I don't release it to a crowd of 10 people.