I am currently using a Mat-124G which I enjoy. Pretty small and self-contained, which I like, and very quiet. The thing that has me asking are the insanely low used prices for the RB (they must have made a gazillion of them.) From past experience I know that I like the 6x7 format very much. OTOH from my 35mm work I simply ADORE the color rendition from Zeiss glass. It seems to me of late that one pays a premium for C-series Mamiyas as well as the Universal and Graflex-XL.