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.
The tiles have images on both sides (for example, on one 20 x 20 foot piece of tile there's a large table but if you flip it over, it can be used for making generic dungeon floor as well).
While there are a few large-sized pieces in this set, the title is a bit misleading. This tile set is more of an introductory set of tiles that can be used to create some really nice looking dungeons and is completely compatible with all the other tile sets that have been released and the tiles being just as durable. Buying two sets of these is probably the way to go if you want to get maximum use out of them.
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.