This is a great treat when you're super hot and on a budget. A small is PLENTY big enough. I can never even finish it all on my own. Some of the flavors are too sweet (I'm looking at you wedding cake and melon...). I found it's best to do a half/half with one sour flavor and one sweet to balance each other out. Surprisingly, marshmallow is one of the best not-too-sweet flavors.
My go to combos:
Sour cherry and cola
Mango with chili
Marshmallow and sour pink lemonade
lemonade remix
Every other time you visit, you'll get a two-for one coupon, a nice incentive to return. Although there is generally never more than a couple of people waiting, sometimes it can take a while, but it's worth it.