I can attest to the hardyness of RBs, I repair them and have dealt with quite a few of em. They are built like Russian tanks and weigh as much.
They have many good points from a photographers point of view such as the revolving back that lets you do wither portrait or landscape film positions without turning the camera over on it's side as you must do with other medium format cameras. Also these cameras have many lenses adn backs available including a digital back, albeit the price of a small car, it is an amzing machine.
The differences between RB67, RB Pro and RB Pro-S in age order is that the older cameras didn't have double exposure prevention features nad dark slide interlocks built in as you do in the Pro-S model. The older RBs to the Pro model, after taking a picture you have to flip a little tab on the back before advancing the film aside from cocking the camera body.
Another featur on the Pro-S is the red indicator bar that moves in the view screen to let you know which format the film is in, portrait or landscape. All models have the Mirror Up feature which is actually built into the lens not the body. Also, none of them require you to have the double release cable, it's just some people prefer it.
Mirror up incase you don't know what this is... it lets you focus the camera and get everyting set up. Then you press the fire button which brings up the mirror without firing the shutter. The cable release is screwed into the lens so now you fire th eshutter via release cable and your picture is taken without the mirror vibrations. Handy to have for very slow shutter speeds.
Another quirk is the T shutter and no B mode. The T setting lets you fire the shutter and leave it open untill you cock the body, then the shutter will close up again. It's a nice feature when doing very long exposures over 1 second. Some people like a B setting, it allows you to hold the shutter open till you let go of the cable release but after you get used to this T mode, B is not really a very good setting after all.
One word of caution... if you do get one of these beauties, DON'T BUY IT ON E-BAY! That place is just someones junk yard. I see more junk come into my shop from there than anywhere else. It's nice to know you have a return policy incase it doesn't work or something is missing that you would ahve never known unless you are familiar with the camera.
I recomend
KEH or perhaps someone off the forums as a good source of equipemt. I like buying my stuff from people I talk to on PhotoNet and here becasue many of the people are either photographers or dedicated to photography not bumping junk on you but are generally honest. I've dealt with people from all over the world on these sites and I haven't been skunked yet in the years I have been doing this.
Another thing you must also know is not to force anything on these cameras. If you try using a heavy hand on something that isn't moving, you are bound to damage it. I'd sugest you download the user manual form the Mamiya site
http://www.mamiya.com/customerservice1.asp?id=3&id2=115 and take a good read of what you may be in for. If you need a hand buying a camera, The nice people here as well as I will give you all the information and help you may need. I have also set up many students with eqipment so if you need anything I can help you locate it since I am always checking the classifieds on the internet and can point you to the source.
Feel free to e-mail me anytime at
automax1@juno.com if you need help.
Good luck,
Paul