The last time I got a Jamba Juice, it was really chalky. I'd drink it and it would taste okay, but then my mouth felt incredibly dry, covered in waxy film.
Smoothie King is fine, as their drinks felt more like actual drinks.
I'd rather just make my own. Cheaper and usually tastier. And then I don't have to deal with "protein packs" or whatever else the stupid clerk squirts in there when I'm not lookin'.
Fruit is already good for you, man. Don't need to go grinding up aspirin tablets.