Based on my experience only 2 out of the 7 premium dungeons offer items better then what i have already found when my party is the same level as the dungeon and i have so far found one item that is given from one of the dungeons without buying it.
Well, thanks for the info. I hope they will keep it this way (well, some tweaking to paid things would be nice, so people paying won't rage). Also, if I can ask you: the premium dungeons are unlocked permanently or you have to pay for each time you try to finish them?
Permanently and they work just like normal dungeons except the first time you beat them you get the item shown at the adventure screen