This drink is Starbucks' Lime Cooler, Coconut Milk, and Berry Hibiscus Tea all mixed in one. It tastes exactly like those three flavors. Which is to say, not very good. Lime and milk and hibiscus just do not go together. To be fair, I'm not a big fan of their lime cooler in the first place, so you might still want to try this drink if you're a big fan of the lime cooler.
Also, love my pic? :P I didn't have time to get a fancy picture, so here's the drink on top of my car. :)