Just sit on a Busa, rock it side to side to feel it's weight.
Walk it backwards while on it, walk beside it and push it.
Any decent dealer should let you do that.
If you feel comfortable on it then, that's all you really need to know.
The Busa is heavy, and you can feel it when you ride. However, many of us have no chicken strips and easily do the same things on a Busa that we can on a 600. The Busa does everything well. Don't let anyone tell you a Busa can't handle, corner, or wheelie, if they do, they can't ride or are simply an idiot.
Don't worry about the power either. The Busa is as easy to ride slow as it is fast. It's all in the wrist.
Bottom line, if you feel comfortable sitting on the Busa and like the riding position, you'll like riding it too.
You already had a heavy non handling Harley, you can handle a Busa.