I would be happy to give a personal recommendation on the colonel, I've known him in the real world for many, many years. He is an absolute straight shooter, and honest as the day is long. I have personally purchased many instruments from him also. He just joined so he doesn't have any feedback, but I would happily transfer any of my feedback scores to him if I could.
If that bass were my thing I would have been all over it, from my understanding it is indeed very rare.
Good luck on the sale colonel!