The East Blvd location is by far the best Smoothie King to visit in Charlotte. I moved here in June 2014 and have been going every since my first visit. Always fast, efficient and exceptional service.
I go usually at opening, 7A, the morning crew is great. They remember exactly what i order, even when they are busy, they are fast at getting your smoothie ready and getting you on your way.
As for the smoothies, I get the Angelfood skinny, only 254 calories for a small, and definitely a great choice if you are looking to control your calories and fat intake. They also have a great selection of other snacks, vitamins and supplements.