Personally, I'd be wary of it as there's no guarantee of the ingredients or purity of the liquid.
Yet, people have no problem using clearomizers, cartomizers, and all kinds of products from china, and most vapers do not engage in a sterilization program when they receive these items.
To the OP: I've seen the youtube vids of tours of chinese eliquid factories, the big name ones......they are mixed in clean rooms, the kind like where computer microchips are made, floors are specially coated, everyone is in clean suits with head and shoe coverings, etc.
I actually trust juice made in those places far far more than some US mixer mixing in the back room of a storefront, etc.
I would say use your own judgement and common sense.
HKHangsen for instance is not some little hole in the wall outfit, they are a huge major corporation with deep pockets with pretty serious engineers and scientists
on staff and inside the facilities.....
how many eliquid companies here can say that?