I dont harvest corn or beans. Will be running wheat again starting this year. I have a full set of gorden rotor bars. A full set of gorden helical concaves (with no wires). A full set of cover plates. And an air-jet chaffer with 3 sets of screens.
All products are quality built. The concaves are a little light, but they hold up fine. The cover plates work great, install ok, and will last forever. The gorden rotor bars are also very heavy duty, made from chrome carbide I believe. I dont have rocks, so I'll likely never break one. They are heavy so you should use a scale and weigh them, then install the closest weight bars at 180degrees from each other. The air-jet chaffer is also quality stuff. The screens are changed out in a matter of minutes. The screens are all stainless, and very close tolerances in building.
Though I cant say much about the performance of the air-jet yet, I've ran the concaves, rotor bars and cover plates for a few years now. The concaves have slightly closer bar spacing than the loewen helicals and slightly smaller material for cross bars. They have no wires which has'nt been a problem in grass, but as others have said, the air-jet will spear with long straw so I'm going to loewens for this year with wires to see if I can make the air-jet work. The cover plates install ok. They can be installed from the left side without any other panels removed and be done in a couple minutes as long as you install the hangers on the right of the concaves before you install them. One bolt per cover plate on the left.
The rotor bars work super for me in a dry hot harvest climate. They transport the material better than the small stock single bars. They have a much higher amount of rasp surface in contact with the material all the time. Combined with the helical concaves, they worked fantastic in long grass seed.