This is the first of this series that I bought (due to being the right level for my players), and I'd certainly buy others.
It's got a 1st edition look, but the adventure is more sophisticated really than a simple dungeon hack. What it doesn't do is say anything like "At this point the players should...". By that, I mean that it is refreshingly free from a need to follow a PLOT. The adventure has a background, and can progress towards a climax, but it has pleasing non-linear elements too.
[5 of 5 Stars!]