This is a very fun and useful item for any edition of the dungeons and dragons game. Having the tiles handy greatly increases play experience, it doesn't take long to put the maps together, and you don't need to worry about drawing terrain features.
With the city streets, rooftops, crowds of people, horse-buggy, and sewer tiles you would have all the tools you wanted for city-street and back-alley setups. It's usefulness would depend on the type of campaign you are running, personally I am going to make adjustments to my campaign and put in a "sewer" run into it.
The tiles have images on both sides for example several of the tiles are of roof tops, and the reverse side they are sewer related.
This is a very nicely done product and worth every penny. Buying two sets of these is probably the way to go if you want to get maximum use out of them especially the rooftops section.
Unfortunately Wizards of the Coast are being affected by the credit crunch and sadly they have recently had to restructure and lay off some staff.
As an example of this they will no longer be producing the D&D Collectible Miniatures Game, instead focusing on non-random and semi-random miniature packs aimed at those role playing 4th edition D&D. There will be two types of packs, one type aimed at players with player characters and the other type aimed at DM's with monsters. Good news for role players and bad news for miniature players.