This place is extremely expensive. I wouldn't recommend the shakes, but the custard is alright. I got the Mississippi mudslide and it was good but not great.
For the price, there really should be more custard/ingredients. It's $6.50+ for a small size of nearly anything. A rootbeer float itself is that price.
I would say that if you're dying for something cool on a hot day, then you can try it. But if there are other options, then try finding something cheaper!