The seller told me he will handle the warranty for me if something happens (but usually if these phones are protected and aren't dropped they usually are quite reliable) because the warranty card said Lat Am and US Virgin Islands. Before I made the purchase, he told me it has US warranty so not sure why he was so desperate to sell. He also confirmed it was the SD855 but clearly isn't so I told him I was waiting for a reasonable partial credit. I might have to escalate with paypal in case he plays hard ball but I have 180 days buyer protection. I have no intention of extorting hundreds of USD but just a reasonable amount.
https://www.ebay.com/itm/SAMSUNG-GALAXY ... 2749.l2649
The reason I bought on ebay was I received the 10% ebay bucks on one of two accounts. If I didn't get $95 in ebay bucks, I would have just bought the unit in Canada because the difference would just be about $100 CAD.
Unless you really want dual SIM, I would suggest you stick with US or Canadian models for warranty purposes but I really haven't had any issues with any cellphones except the potential battery bloat on our 6s phones (bought in the US) that was replaced by Apple Canada.