I'm adding one, because it really is a must for any serious distance riding. Of course it will be ugly, but it can be removed when not needed.
This past weekend, my wife & I (used 6 soft bags, including tank bag - with total weight of about 380 lbs) did 526 miles. The chain was just adjusted and treated with Maximum Chain Wax prior to leaving - after the trip it did not need adjustment and it was still pretty much lubricated - most of highway travel was between 80-105 mph- the Busa loves running fully loaded at 100, barely breathing. But I wouldn't want to ride any further without a centerstand for tire and chain maintenance.
RD