My nephew (11) likes it. We were in some shitty mall over the summer, and he just had to have them. The markup...is just ungodly insane. It basically amounts to a 12-oz cup of bottom shelf bagged malt-o-meal puff kid's cereal (let's say ~15-20 balls in a cup), and maybe half a cup of LN2.
....I pay our electron microscopy core about $1/L for LN2 when I need it, and this includes a markup that he charges users for buying from his stock from the distributor that he keeps on hand at all times. The cup of dragon's breath was $10, for stuff that costs about $0.70, if you're being generous. (When I was purchasing LN2 directly from Praxair some years ago, I think it was $70-80 for a 160L dewer...I think.)
Also, I love the stern warnings about avoiding direct contact with the bottom of the cup, where the pooled LN2 remains in liquid. Yeah, that's just brilliant.