Like everyone else here, I've done the Tier V quests alot, and generally, I always figured I'd be better off doing the Tier IV house with all the bookshelves, or the Tier IV church. (With all the bookshelves) I've never thought the factory's were "worth it", except they are more challenging so you do them for exp and for fun.
But Dishong is different!! I don't know if Dishong has always been this way, but I have yet to do a Dishong run where I didn't come out with more ammo then I came in with. Also, there are a bunch of bookshelves, especially up towards the top. Since trying to find the hidden recipes, or the last perk books, is usually what I'm trying to do at this point, I like this POI quite a bit.