Love 645 format. Shoot a Mamiya 645 Super kit and prefer it to 6x6. Plain prism finders seem mandatory on Bronicas and Mamiyas. Just enough extra film real estate over 35mm makes the case for 120 neg scans.
Problem now is difficulty finding Bronicas that weren't shot to death--an ironic fact of their popularity. Too pricey back in the day for most casual/non-pro shooters. I own and love my Bronica 6x6 and Mamiya 645 and 6x7 kits but have few illusions about the viability of film photography as regards future equipment survivability.