Worth going once for the novelty, but I don't plan on coming back.
It's a fun concept: soft serve ice cream covered in delicious and/or outrageous toppings. Went recently and got the Cookies Cookies Cookies and Cream. My wife got the brownie one (don't remember the exact name). The toppings on both were delicious. Unfortunately, the best thing I can say about the soft serve itself was that there was a lot of it. But it wasn't particularly good. Not sure how to describe it - but it felt drier and stickier than usual soft serve. Maybe a special formulation so that it can support all the toppings they heap on? Regardless, neither of us finished our ice cream (but we did finish the toppings!).
I'm glad to have gone, but wish I had gotten a small. And I don't really plan on going back.