I also purchased the Oneplus1 in Jan last year, I shipped it through Shipito in the US..
Great phone, design, specs, battery etc but the problem is repairs, spares etc.. I used the phone for a few weeks and the dropped it, which cracked the screen.. Oneplus wanted me to send back the phone for repairs which was working out to almost $300, the price of a new phone, so I scrapped it..
I also tried buying a replacement screen from China, paid around $50 but it was faulty and the supplier only returned about half of the money..