I have been on /p/ for quite sometime and those who have been here with me have seen the absolute myriad of cameras I've posted here everything from a 110 Kodak compact to a 5x7 from the turn of the century, one of those cams was a full RB67 Pro-S kit, with 50, 90 and 180mm lens 4 backs, Polaroid back, and it was stolen a year ago.
Of all the things stolen from me in life if I could have any of them back it would be that camera. It was my absolute favorite camera I have ever shot with, everything about it is perfect, except for the carpal tunnel syndrome I got trying to carry it by hand because it weighs as much as a Smart Car.
Get one, you will not be disappointed. Get the 6x8 motor drive and 50mm lens. Shoot Tri-X, get some filters and have fun. Get the left grip and the metered prism.