The extended warranty does double the factor warranty from 5yr/100,000km to 10yr/200,000km and is transferable if you sell the car before hand, so you may get more for it with extended vs non. However, I'm from canada and got my Seltos serviced at a Kia dealership in Idaho last week, and the Service Tech told me that If you were to move to a different country, Kia does NOT transfer the warranty, regardless of mileage or time. You actually get 0 warranty if you move to a different country. He wasn't even able to check for recalls.
I have a pamphlet that I got with everything the extended warranty covers. I'll post aome pitcures of it later tonight when I get home.