Cool N2 gets a thumbs up from me. I think it's for the 'fun factor'. Huge tanks of nitrogen greet you on the way in giving you an impression of laboratory rather than ice cream shop - that's fun, especially if you are a science geek!
My wife and I shared a mango pop-ice which seems to be their best seller and it was really nice. Its well priced at $6.50 after tax considering the price of dewars and nitrogen etc etc etc!!!!
The cup has some sort of a custard like base which they then layer with the nitrogen ice cream and mango syrup finally topping it off with chunks of mango. They then insert a little syringe which is filled with mango syrup for you to squeeze to your hearts desire. Before they give it to you, a pretend pour of liquid nitrogen into a tray for your photo moment. We were quite entertained.
Now wait, you're probably going to say you wouldn't be entertained by just that right? Ok....here's something I saw someone do that I REALLY want to try the next time I go.... a cup of cheese puffs were doused in nitrojuice (thats what I call the nitrogen here so don't go asking for it), then the puffs were eating making the eater look like a dragon from Game of Thrones!!! Cool N2 ....see yah soon!!!
The ice cream itself is really tasty and quite enjoyable! I recommend! Did I mention that they let you syringe sweet syrup into the ice cream yourself!? Oh yeh....
Great for an after date desert if you're a boring person too!!!