Hi Guys, I'd also like to hear the reasoning behind not using one. I have heard other guys saying that they really help on the rotor loss in the corn. I'm in mostly wheat, but I would think that the basic principle would be the same. Also guys, If your looking for a new enclosed rotor check out the ones that St. Johns welding offer. I'm not trying to take anything away from sunnybrook, but St. Johns also build a pretty wicked looking rotor.I think either one would be great, but they are a little out of my reach price wise. Thanks!Darin