I own a 9600,9610, and a 2166, if set right they all 3 can do the same job, the red one is a little better in corn , but when the guys run them in soybeans nobody wants to run the red one. I have had several j.d.s and have never bought a walker yet, but I have put in a couple of rotors due to a rock coming through, when I trade the 2166 or the 9600 for a 9650 it will be a walker and not a sts. Just my .02 worth.