I actually just bought one from the store and had to look up how to eat the damned thing.
First off, the look CRAZY on the inside. Completely white fruit with a ton of black seeds. Delicious as hell too.
The juice does a very good job of imitating it... The candy flavors are far too strong. Real dragonfruit has a subtle sweetness and flavor.
I'm about to load it up and try it out, but the smell is almost spot on (Maybe a little too sweet, but more VG can do that)