I've used a GS-1 that was loaned to me and as much as I like the ETRS, had I tried the GS-1 at the time I opted for the ETRS, I'd have opted for it instead. Having the 6x7, 6x6 and 645 formats would have satisfied me even at the loss of the 35mm capability I use quite a bit with my ETRS. As for lenses, I have a decent selection but in the end only use 2 for most of my work.

The beauty of the Bronica system for me is the shutter in lens vs shutter on body and the ability to build a camera that feels good and meets the want of the moment in versitility.