This latest harvest in recent history has convinced me to look for a different combine. I have narrowed my search down to a 9570. What I have not been able to find, tho is what changes were made to this machine during its four year run. Even JD dealers I have talked to have not been much help. Does anyone on here have this information? Were there changes made that justify the difference in prices I am seeing for the different model years? Thank you in advance for your assistance!