In the first few years it was running 800-900 acres of mostly soybeans with some wheat and milo as well as some custom cutting. The last few years we have been harvesting 150-200 acres of corn and 300-400 acres of beans and some wheat also. We have probably covered 8000-9000 acres since the bars were replaced. We have never had any breakage but we also have no rocks so that may make a difference. Most machines in my area run the chrome bars.