I have a Mamiya Universal that I bought in the mid 80's. Although the Universal is a rather heavy camera with the hand grip it is very hand holdable, works well with a monopod, easy to use in low light, and very quite. Draw backs as with any RF, limited lens, I have 3 of the 5 that were made, no depth of preview, and because I use a Universal I have to cock the shutter, no built in light meter, and the one long lens a 250 is very hard to find and expensive. But is does have interchangeable backs, a ground glass back and close up spaces. I have used a Koniomega Flex and serveral SLRs, the only camera that has tempeted me is the Pentex 6X7.