A local JD dealer sold a used STS recently. After that the man bought $ 10,000 worth of parts to fix it. We had four, bought at around 700 hours and traded at around 1100 hours. The dealer had been through them and put $30,000 worth of parts into those. After we were through, the new wheat concaves were junk, the steel rotor housings had wholes blown through. To make it short, we went back to conventionals. They are good enough in our low yielding wheat and the concaves last at least two years.