Would you take your BV on the highway? How much storage?
It wouldn't be as stable as the C600 but under the right conditions, yes. A 3,4, or 5 lane freeway during rush hour and people doing 75mph, I would avoid. Most of the roads I ride are one and two lane state highways so I wouldn't fret. The thing that I am concerned about is comfort for my legs. I've gotten used the many foot positions of the BMW but the BV they are pretty much locked in. If you look at the top picture, the floorboard is slightly slanted forward and it feels like the feet get locked in, but not in a bad way. Same with the butt stop. It's more intrusive than the BMW. So, my riding position is pretty static. Not a bad thing I bet when the road starts to get twisty. It has a 16" front tire and 60"+ wheelbase so it's pretty stable at speed. It's got some good get up to it also.
As for underseat storage, not deep enough for a full face helmet, but still pretty deep. It's also long. So, in reality, maybe better than the C600. Hard to tell right now really. But my first thought was, "Wow, that's nice". I'll add a 36liter top case and be good to go.
I'll get some pics in the daylight of the storage and the glove box.
It's not "das machine" like the BMW, but more like a sporty hatchback. Think, Mazda 3 hatchback, but with Italian finish and flair.