Since its newly opened, I assume they may be still working out some stuff. For example, when we visited it was extremely hot and stuffy inside which didn't feel like a great environment to enjoy raw fish.
They kept some water in the fridge for dine-in customers and that helped a bit. On a hot summers day you probably wouldn't want take out either, unless you live nearby or you'd end up with tepid raw fish bowl.
I thought the size for a regular portion was okay, though it might be a tad on the small size if you're starving. I'd recommend you'd just make your own bowl because they do have a lot of good toppings (like lotus chips!) to choose from. I was jealous of my friend's custom bowl as my Big Katuna just had a lot of cucumber. I felt like the dish was missing that bold, fresh flavour I would expect, but that might have been because of how ridiculously hot it was inside.