I'm very comfortable with the 600s, my friend made me ride his zx6r quite a bit since he wanted me to get a bike to ride with him. At first I didn't want anything to do with bikes having passed by an accident scene on the highway one day in the opposite lane. All I saw were bent handlebars sticking in the road and a blood smear for quite a ways down into the grass. After I hopped on my friends 600 through months of convincing me, it was the most exhilarating fun I've had in forever. I practiced with him in my quite large neighborhood then parking lots, and eventually the street. I haven't dropped it yet and the slow maneuvers are quite easy on the 600s, and I understand that the weight of the 'busa is dramatically different. I've redlined the 600 a few times and it is quite fun, even for as large as I am (6'1", 240 built). The 'busas look gorgeous to me and I can easily afford payments on one(after I build my credit a bit more). This will be the first bike I will have ever owned, and probably the last (not due to death) since it looks at feels like a dream.