Thanks everyone! I am having a huge amount of fun with the RB67.
The first few rolls through the medium format had me fumbling, not feeling very comfortable at all. I REALLY missed not being able to look at the screen at the back.
The last couple of rolls though, something just clicked. The camera itself kind of just faded to the background and I started to "see" how the photos would turn out before clicking the shutter.
I got this some with my DSLR, but for some reason (I guess because of no screen) it became more pronounced with this old film camera.
I am now on the lookout for a cheap field 4x5. It might just slow me down that much more