I bought a Hyosung GV 650 a short time ago. After filling it with gas for the first time, fuel began RUNNING out of the left side of the fuel tank. It was still under warranty, and so I took it to get repaired. This was over two months ago, and it is still not fixed. The shop cannot get parts from the manufacturer.
Don't waste your time with these bikes, they are junk, and when they do inevitably break, you can't get parts for them. As far as the customer service, they seem real nice until you realize that they are lying to your face.