Ever since I have discovered 0one Games I have been using their products regularly in my own adventures. This product is interesting because each map can be fitted together the way the GM wants to create a huge Sewer complex or he can just use the map he need for his current adventure and save the others for other times.
Basically it's a very nice and simple sewer map that can be adaptable for any use of a sewer location.
You may be able to 'go wrong' buying a Oone's product, but if so, this isn't where it happens. A lovely, high-quality set of mapsa exactly as described.