Civ V, for all its defects, is one of those games that stays on my HD and I know I can turn to it for a few hours or a day or two of solid fun. The expansion sounds good, even though much of it does seem to be a re-hash of what was already in earlier versions. OK, I'll bite and buy it anyway because if it is like the G&K expansion, it definitely will add complexity which to me is one of the best parts of a Civ game.