I'm not a shaved ice specialist seeing as this was only the 4th time having it. But I can say overall Hawaiian ice puts slurpees to shame with all the flavor they pack. At the Shave Shack you can get a kids size for $2.50 and that was plenty even for a big eater like me.
The shack is unassuming located on the corner of a gas station off of Jones, but it would be silly for this place to have a large location considering they have 2 ingredients of ice and syrup!