In regard to 8570 vs. 8560 I have owned and operated both over severl thousand acres. The rotors are the same. The concaves and grates are the same. The 8570 has a Cummins C series and the 8560 has aCummins B series. One main difference is that the 8570 has a reinforced rotor cage. In very tough going the rotor cage on the 8560 will spread in the middle and cause a bigger gap in the middle and eventually crack the supports in the middle. They both do an excellant job. The 8570 that I owned had a better chopper. The controls in the cab of an 8570 were improved.