Playing XCOM: Enemy Within, and am thus far enjoying it alot. It's a definite improvement over the other rather lackluster DLC, and adds alot more to the game without actually breaking it or making it too easy. The biggest problem with it, however, is its steep price. Although it does add alot of content to the game, I still don't really think it's worth the price they're currently peddling it at, especially since it still requires the base-game (and essentially ia just the base game with a mini-campaign and added content) to play. I got it during the christmas sales, so I'd recommend waiting for it to go down in price before buying it.
