The production value of the product is outstanding, specifically the "Rule the DUNGEON!" feature which allows map presentation to be customized. The black/white rendering of the maps and the line art give them maps a sparce appearance. I happen to like the look -- YMMV.
I also like the room templates; a single page for each room showing it map and having space for the GM to write down the room description. This would be more useful if you could electronically edit the templates rather than having to print them out. The set of random encounter tables for each region in the dungeon is a nice touch. A brief story for the dungeon is provided.
The one downside of this product is that it is in PDF form, rather than JPG or PNG. Hence, if you want to use it with a VTT, you are going to have a fair amount of work on your hands. That said, the product was created in 2009, so I am not counting this against in in my rating.