This is a great module. My players are about halfway through it. I'm a new DM to that group, and when I asked how they were liking it, one of them said:

"I've never been in a campaign where there was so much story! And I've also never been in a campaign where combat was so terrifying..."

Granted, the combat thing came from my tweaks and such, but this module was really easy to tie into my homebrew world and has been fantastic so far. Deadly module, especially if you try to make it more challenging by adding creatures with the tough elementals.