I use a Bronica SQA with a metered prism as well as a Mamiya RB with a metered prism. The Bronica is by far the easier to use and got some great shots hand held from a moving boat with it and the metered prism is easier to use than the RB's. The Mamiya does have some jaw dropping lenses and is great for macro stuff, but it is heavy to lug around the back woods. Keep in mind I'm 62 years old. I prefer the 6X6 format but the 6X7 aspect ratio is great for a lot of things. Bottom line? With the prices as low on outfits and components I'd keep the RB and put together an SQA outfit for when you want something lighter and more handy.