As a long-time collector of Dungeon Tiles I can say without reservation that this is the best collection yet published. True, most of the tiles are recycled from old sets (all of them as far as I can tell), but with such a low price, a full ten sheets of durable double-sided tiles, and the incredibly handsome and even useful box, the new Essentials line of Dungeon Tiles outshines every past edition.
What is this thing?:
Dungeon Tiles are handsomely detailed pre-printed heavy cardstock 'pieces' that you can use to cobble together a map for wargames. In this case the tiles are sized for D&D miniatures (~25-30mm), with the grid spacing hovering around an inch. The Dungeon Tiles sets include a whole pile of tiles representing rooms, corridors, furniture, traps, and the like.
The Dungeon Tiles Master Set - The Dungeon contains a smörgåsbord (a lot!) of tiles collected from previous editions, enough to build a respectable multi-room dungeon out of. With a full ten sheets of double-sided tiles this is the biggest single collection published.
In addition, the oversized box the tiles ship in provides superior protection to the tiles within, in addition to being a giant tile itself (the box is printed like a dungeon plinth and made from the same materials as the tiles themselves). The box is easily big enough to store any loose tiles you might have collected from previous sets too, at least twice as thick as necessary for the product within.
There has never been a better value in dungeon tiles published by Wizards of the Coast, between the number of tiles for your money, as well as the very handy box, this is a fantastic way for new DMs to build their collection of handy tiles.
Altogether this is a wonderful product for new DMs, or for those who wish to expand their collections. If you already own several copies of every other Wizards produced Dungeon Tile you will not find anything new here beyond the box.