The Michelin Guide, which awards the incredibly coveted Michelin Stars to the very best restaurants defines its highest award of three stars as an experience that is "exceptional... worth a special journey."
I cannot think of a better way to describe KA. It is worth a trip to Las Vegas just to see it. Fly in, get a hotel room, and see this show. If you don't gamble, don't drink a single drink, and travel to and form the show blindfolded so you see nothing else, you'll have spent your money well.
I could describe the show, but words fail. They don't do it justice. They took a permanent space and used it to create a show that couldn't be anywhere else. So go see it, already.
Oh, and don't forget your glasses at home like I did.