The cold brew is good, and the donuts are amazing, but all together this drink makes a Frappuccino look positively bitter. Even if you don't stir in the whipped cream and you don't dunk the donut (which would be outright un-American), it's powerfully sweet.
It may be best to consider it a dessert and not a coffee drink, and under those circumstances it's a refreshing, fun summer coffee. The drink probably doesn't fit inside the daily diet of any healthy person, and the syrupy, sprinkle-loaded dregs at the bottom are a bit too much, but the first half of the drink is worth the price of admission.
The worst case scenario here is that you're getting the caffeine you can't live without, along with a damn fine donut.