I haven't tried too many outside of their tobaccos, but I'll share what little I know:
Green Orange - A nice and realistic tart orange flavor. I use it as the higher percentage (4%) along with FA Orange (along with a few other flavors) for an orange flavor that is popular with several of my customers.Those are the only two orange flavors I've tried so far, so not much to compare them to. While FA's is bit more "fresh squeezed," HS's is a bit more "just plucked from the tree."
Fruit Mix - Kind of a generic fruit punch flavor (4-5% is what I've tried it at). Nothing special. I don't use it much.
Caramel - Maybe a tad creamier than FA's? I think, just out of habit, I continue to just go with FA's, so I don't use this one much either.
That's it. These are just ones that happened to be in stock when ECX was running their fire sell on HS flavors. I don't use a bunch of their tobaccos, though I feel a lot of them are quite similar tasting (though still very good).