My butt's never been too impressed with Corbin's approach, although I have one on my T-Max that works quite well.
Rick Mayer built one for my ST-1100 that was comfortable and I put a Russell DayLong on my R1200R that was very comfortable for many hours at a time, although DayLong's can look pretty weird, especially on a small bike like the Zero. At a certain point, however, I subscribed to their motto: Beauty is in the butt of the beholder.