Have you seen the commercials for this? It looks even more disgusting in grilled version. Somehow they managed to keep the calorie counts pretty reasonable (which makes me doubt its existence as actual food) but the fat and calories are outta control.
Sandwich Calories Fat (g) Sodium (mg)
KFC Original Recipe® Double Down 540 32 1380
KFC Grilled Double Down 460 23 1430
Here's a picture of the real deal taken by some brave eater.
Maybe I'll rant soon about my opinions of food in America, but for now I leave you to digest this. Haha, pun intended.
Also, check out this link for a much more in-depth description of the DD: http://www.avclub.com/articles/kfcs-double-down-sandwich,32804/