I am happy with my GSW690III, i did shoot with it 4 days ago, and just developer a film out of it few hours ago, this camera and the format 6x9 is something else, and this camera will be definitely one of cameras i will carry when i travel, nice format and results out of it.
for GW670III, i really would choose Mamiya 6x7 over it anytime, i have 3 actually, RZ, RB, and Mamiya 7II, and i was able to buy that Fuji GW 6x7 any model in the past, but i just passed it and went with 6x9, never looked back.