I bought a 12-oz Tall cup of it for $4.45.
There's a really enjoyable honeyed graham cracker flavor to the main portion of this but it didn't really taste like coffee at all. Texture-wise, it was, for the most part, fairly smooth with a few icy bits here and there.
I'm not sure how infusing whipped cream with marshmallows really makes any difference... Maybe the whipped cream was a little puffier? The graham cracker crumble on top seemed mostly for visual effect as there's not enough to be impactful unless you just want to scoop it off the top and eat it.
Nutritional Info - Starbucks S'mores Frappuccino - Tall (12 fl oz)
Calories - 330 (from Fat - 130)
Fat - 13g (Saturated Fat - 9g)
Sodium - 150mg
Carbs - 47g (Sugar - 43g)
Protein - 3g
Caffeine - 50mg