Where are you coming from? Hope you have a fantastic trip! I really love the SB app, and mobile ordering is especially nice at
Disneyland where the stores can get really crowded. The app allows you to personalize your drink and it saves your choices which is great for me because I usually get the same couple of things, so the next time I order it I just have to make one click. It also lets you use star rewards for part or all of your order. I'm sure you know this, but you can only use the app in DTD. The park stores don't do mobile ordering (but you can use an AP discount there, which brings the price down closer to what I pay at home
).