I had a really great caramel cappuccino made with almond milk once. But the next two times I went in there they didn't have almond milk and the drinks just didn't taste that good (inconsistency bothers me). I don't think it was the fact they used dairy instead of almond milk that it tasted bad. The last two times I went they tasted really bitter and chemically, probably from the caramel syrup.
Seeing as I love local establishments, I will be giving Cannon Coffee another shot. But I think I'll stick with coffee instead of a flavored drink.