Here's a simple reason. Sony USA will not repair that model.
Bob
I am interested in the Sony Vaio X505 but cannot afford the US price tag of $3000. i can purchase the Japanese import for $2500. The review on CNET says to wait for the US version. Why?
What are the cons of purchasing a Japanese import?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic