I can second what has bee said, very accurate eval. I used Gs-1 for many years shooting commercially when they first came out. I liked the 6x7 size frame, the auto-exposure meters are right on, at the time no other Med format had it. I still have my complete system- 3 bodies, both, prisim finders, all the lenes (all very sharp ) 7 -120 film backs, only shot 120 trans, speed grip, polaroid back (good luck finding any Pola film) all has been stored in a heavy duty "Anvel" type reusable shipping case. I went digital when PhaseOne came out in 1990 ish with Hasselblad format. I'm retired now for many years and plan to ebay all of my stuff, but it is slow going, ( or should I say I am slow going.
www.mikenykoruk.com