DDEX3-10 is a lot of fun to run, especially against a fighter-heavy party. In spite of other criticisms, there are several opportunitites for roleplaying, especially with the incubus Mardivec. I never had him attack the characters, but he managed to seduce one of the fighters (in a very PG-way) while shape-shifted, and give his necrotic kiss. It does tend to run a bit long, but the maps clarify the layout and evoke a strong sense of place. We never got to the scarecrows, but those encounters looked fun as well.
The adventure is definitely on the hard side, and I'd say it's optimized for a party of five 4th level characters or maybe even six. Our APL was about 3, though we had between 6 and 7 every session. I almost TPKed all of them, and had to pull a few punches, especially when Agrak came out with his carrion crawler.
The game runs a bit long. Expect between 8 and 12 hours, depending on how you play it.
[4 of 5 Stars!]