Well Hell! IJ I have operated the 9750! It is one Fantastic combine. There is nothing at this time that will compare to it in corn. No if ands or buts. It will do a great job on sunflowers,less than 1% dockage. I watched this machine in part of it's developement, it was on our farm. I am sure that it was on a number of other farms as well. I also watched the TR being developed and tested. This was done on our farm. The work was done in OUR shop.I watched as they did changes, then back to the field. Might only cut a 100 yards and back to the shop. Very minor changes have a significant effect on the combine. I saw there millwright, what a metalworker that man is.He could do things I only dream of. I saw a combine from NH that was a grain eating son of a gun. I have demo ed the Big Cat, really good machine. Costly (aren't they all) as heck. To sum up my experience, give me JD green and a MacDon header