well they seems like legit. let me say this again, i have done small level dealings only and so far its been great. what ur buying is branded expensive stuff so thats unknown territory for me. the seller has excellent feedback and that counts a lot but its not the seller that worries me, its the way it could be handled here in Pakistan. there is a slim possibility that ur package gets detained by customs in which case u will have to pay extra. this has NEVER happened to me when buying from ali express but who knows.
so long story short, the seller seems legit but u must be prepared to risk getting them through our postal service.