Just got back from running two rolls of film through the RB67. I went hiking up into the Snowy's, roughly 11,500 ft. I hiked only 5 miles, but I brought my full digital photography bag (~35 lbs, I can never leave anything behind

) and the RB67 on a tripod.
Since I hike with a lot of gear (a lot of weight) all the time, I really didn't feel the difference lugging the RB67 around. It balanced on my shoulder, mounted to the tripod, just fine, much like my D600 and a heavy lens.
I should have all my chemicals tomorrow, so I'll get to develop the rolls. The only problem right now is, I don't have a negative scanner. I do have a flatbed scanner, but it isn't set up to scan negatives. I am planning on getting a V700 within a week or two.
I am going to have to find some cheaper film, or sell some other gear though. I can tell already that I am going to LOVE shooting medium format, even before developing the first rolls. It is a very different form of photography and feels like it will fit real well with how I go about shooting.