Meh. Somewhat interesting, but the typos and missing segments make it a pain to run. The initial encounter tries to put a timer on the adventure, but almost every party will be able to deal with the effects via spell rather than having to rush. The initial fright of four beholders is pretty nice though. Get the errata ahead of time and it won't be too bad, but it's still not the best.
[3 of 5 Stars!]