I tried SK just yesterday. I love smoothies. We make them at home. SK's smoothies are very good but PRICEY! It turns out these are supposed to replace a meal. It does not. For the price, I'd rather "chew" my food.
Again, I liked my smoothie from Smoothie King but I can make them as good or better at home - for less. They need to chop their prices down by at least a buck for each size.