The Ninja (600) is "widowmaker". Just cause it ticks the wife off. Plus, it's just dangerous; not dangerously fast, just dangerous! It makes me do stupid things; like lane-split at 65; while traffic is going 15. I've fallen asleep on that bike and somehow it still gets me home. Good bike.
The Busa is appropriately named, "The Beast". Cause it is. Start it up and you hear it say, "Yep, I'm the Beast and I can kick your a$$; go ahead, bring it on". No sleeping allowed.