I think it has impressive straight line performance on the highway. It seems to get real stable going fast. You can definitely make it go faster if you lie down on the tank and get out of the wind and slower if you sit upright.
Sixth gear comes unto its own above 6k and it's easy to stay with the flow of traffic. Short connecting trips on the highway are absolutely no problem for this little dude. It wouldn't be my choice for a long highway commute, as there is some buzz to it.
For casual adventuring it's fine. If your going to do major cross country runs, that will probably take some training.