This isn't the best Judges Guild product. Although for relatively high level parties, this adventure has an entire level of low (1-1 Hit Die) creatures for some reason that I can't fathom. Other areas contain creatures that would make high level parties shudder.
This adventure isn't near as imaginative as other Judges Guild products (i.e. Caverns of Thracia and the Dark Tower) and lacks, in my mind at least, any clear cohesiveness other than the obvious (connecting passageways and rooms, etc).
I think that with some work on the DM's part, this adventure could be very good.