Once again Skirmisher has produced another useful, high-quality gaming product. The only problem I can think of is that most people might not be as interested in buying ideas for exploring sewers as often as they would for regular dungeons.
That said, this is still a fun read, the art (by William Trasher, as usual) is hilarious, and there's a VERY unexpected table at the end.
So if your campaign ever visits a sewer, this sourcebook is definitely for you!
[4 of 5 Stars!]