Hello Onion Farmer, I have the silver-twin to the 8680 (Gleaner C62) and I am quite happy with it, but not elated! In corn or beans the machine is great, but I've continually had trouble throwing grain over the walkers in small grains, especially barley. I've tried concave mods, but to no avail; - the 128" walkers lay too flat within the machine, as far as I'm concerned, and this is the machines biggest deficit. Slowing down 1_2 mph solves this problem, but the machine is still no comparison to my Deere 9610. (I have both machines)