It's a great product about one of the (seemingly of late) forgotten parts of the Forgotten Realms. It's well made, gives more details that WOTC tends to ignore in their adventures and suppliments (ToD and SCG details on Thay were, quite frankly, really lackluster) and really makes delving into a lot of the other areas and brings me back to the olden days of these sort of books. Lots of good ideas for adventures in this area, and honestly, I'm always up for additional content from 5E Faerun that isn't in the Sword Coast. Adventure within does a good job showcasing the setting itself and hopefully you can find it useful in setting up your own adventures here.

Also, I tried to make the Cardrauth and it ended up tasting pretty good.

The real question is not "How useful is this PDF?", but "Which bonehead at WOTC thought it was a good idea to not have this in the DMG in the first place?"

5/5. Pushing everyone I know who plays 5e to buy this.

All and all, a solid little adventure with a few twists and a overall enjoyable experience for the players I ran it for.