When I was a portrait photographer, from 1979-81, the studio I worked for issued me a Bronica ETR-S. With normal lens, speed grip and plain prism finder. My colleagues and I used them to shoot high school group portraits and "candids"(for the actual portraits we used 70mm long-roll studio cameras).
We generally shot those groups with a big Metz flash on a bracket, and another on a stand (we prided ourselves on good lighting). The ETR was a perfect tool for the task; fast, rugged (we used them hard), a fine lens, excellent image quality. I enjoyed working with it. Sadly, that job did not pay enough for me to buy a Bronica of my own (or even enough to live on) and I had to turn the camera in when I left. But now, assuming good condition, I think an ETR would still be a fine usable camera.