A Green combine leaves the field green after harvest, so you might as well buy a Cat so the field stays golden yellow. Gleaners are a good combine too though. I really like them, I have run over 25,000 acres with one R-62 and I can count the breakdowns on one hand. I also can say that some fields I have seen after I have ran in them have some green, but a conventional combine will never do as good as a rotary, I don't care what color.