The only question is how they handle delivery of damaged goods.I would personally be happy dealing with srne directly. They quoted air delivery to my address.
AliBaba and AliExpress give you pretty good protection against at that possibility (and excellent coverage for non-delivery).
Until a Chinese vendor has established a reputation of making US buyers while when there is a shipping problem, it’s safer (IMHO) to purchase from them but trough their AliBaba or AlExpress storefronts…