They cost half as much because you will need to buy 2 of them.
One car to drive while the other car is getting fixed and needs parts flown in from Korea. I knew a woman that had one a few years back and it was in and out of the shop frequently. It looks like it has a great warranty but they WILL NOT give you a free loaner when it needs service/parts and it WILL need service. LOTS of it.
Parts were not stocked at that time so you have to WAIT for them to come in. Maybe things are different now but why bother?
Stay away!
-Mark.