I'm not quite sure what I think. It looks like something out of a commic book. I think the scariest thing is that there doesn't appear to be any kind of support for the rider; like you could just slip off or something.
![Smack](images/smilies/smack.gif)
As for the V4, the Ducati Desmosedici uses one based on their MotoGP liter bike. It is psycho. For me, money no object (about $70g), this is about the most beautiful street bike in the world:
![](http://motorgen.com/pic/data/500/desmosedici.jpg)