I go to UK, Mellow Mushroom is awesome. As far as smoothie king, I love thier protein shakes, but it is very exspensive. We have one in our Gold's Gym in Lexington and it seems to do very well. I had a friend who drank one after every workout, but stopped after I told him he could buy a six month supply of protein for what he was spending there in a week. If I were to open one, I would make sure it was connected to a well established gym, and have some sort of frequent buyer discount for those people like my friend. I think you get every 10th smoothie free now, but you should get a better deal than that if you're going to spend $5 a shake.