Well as mentioned before, it has good drops, easy to run, very easy to profit. It's unique because of it's design (every room except troom and boss room is the same) I myself don't like it but I understand why it is so. It's supposed to be the ''Lost'' Halls so you can't navigate as easily as in other dungeons although the fact the community has adapted to it so well makes it one of the easier dungeons imo. Haven't died in it for awhile now and when I did it was due to lag from the sheer amount of players.