I had a large papaya-mango smoothie with tapioca, and it was really good, though kind of expensive (which is fair, I guess, as those two fruits aren't cheap). The place is great in that everything can be customized.
However, I have to take one star off because the store itself was kind of terrible. It was basically a stark white room with a couple of freezers, a blender, and some large containers of jelly. Not exactly a place that makes you want to stay and relax.