Its quite fun. I played through the Solitude sewers and enjoyed it. There's some tense moments, and its a whole different setting and type of encounter. It might be nice to have more of a reason to cruise down through them, but then this would be a quest mod. The secret entrances are worth while in their own way. I'm not exactly sure how to work it in to the game more, but, y'know, people dont usually go down in to the sewers without a reason. Maybe even just a friend who shows you the people who live down there; or a faction, the under-dwellers and beggars, who are always looking for food and fire-wood... perhaps? ...Or an underground cathedral to apocryphal dieties? I dunno something social - religious seems appropriate. But its pretty good the way it is, too, just sitting there, inhabited by wayward miscreants and mis-fortunate fools. We always want more, is all. I have a big appreciations for this. The underground portions of a city, real and fantastic, are its hidden heart; a sort of unsung architectural wonder. edit: btw there will be spatial conflicts with city ovehauls and such if not patched - relatively minor ones though. In my case, it was Solitude Capital Edition (with that Tudor architecture), and that pirate ship quest mod which adds to the docks.