We installed a Kile on a 1640 this past fall and had good luck with it in soybeans. We were able to gain 1/2 to 1 mph and we could start picking a little earlier in the morning as well as pick a little later at night. You will likely see the same results with a Stewart, or the AFX you can get from the Case dealer. From what we have seen the auger front is a lot easier on the combine, it feeds evenly, and it reduces rumbling in green stem beans. I am interested to see how it will work in wheat this year.