I have had a couple of women on the back and they both like it. I used the Corbin setup the last time, and it was awesome. It even gave me a sense of comfort.
However, the question is a relative one. It depends on your and her past experience. If you are used to a Gold Wing, it won't compare. But as far as sport bikes, super sport bikes, or sport touring bikes, the Busa is at the top of the heap. With a few modifications, it becoses an awesome bike for touring.