My girlfriend and I always go for rides on the NC. It has plenty of power to accomodate two riders and a glovebox full of goodies.
The only comment I should incude is that my girlfriend is significantly shorter than me (about a foot) and the rear seat isn't raised enough for her line of sight to clear the back of my helmet. This shouldn't be much of a problem for most couples, however.
G650 XMoto (Sold)
Fast stang :)