I can't speak for how well the Corbin works on the RC, but it was the best money I ever spent on mods for my Blackbird. With the stock seat, the old ass-burn would set in at about the 200 mile mark, and from then on it was sheer agony all the way home. I bought a used Corbin (still pricey) and installed it, then took an all-day test ride. Unbelievable. The Corbin eliminated the pressure points from the stock saddle, and completely elimiated the pain.
That summer I took a 750 mile trip (one day's ride) to PA from TN, and the Corbin was a God-send, allowing me to cover the miles without agony. Only draw-back is that you're pretty much "planted" in one position w/ the Corbin, at least on the Blackbird, so if you tend to hang off the saddle alot when cornering, it does restrict your body movement a bit. I never found it to be a problem, but then I don't drag knee.