I used to own a Bronica SQ-Ai, and had a PS 50mm and PS 80mm lens. Overall I would say the camera and lenses were well built, and image quality was excellent (dare I say underrated?).
My only complaint would be that the camera was heavy; it is not something you would want to walk around all day with round your neck. When combined with the AE prism finder it was a bit heavy for me to hold at eye level to use, so a tripod was usually needed.