Has anyone tried the Sunbelt aftermarket blades on their Ferris mower and tested the quality and longevity vs the OEM blades? We have found that the OEM Ferris blades seem to stay sharp longer than any other blades we have tried, which include the Gator Magnum G5 and G6 Fusion blades... and the medium lift and extreme high lift from Oregon (non-Fusion). We could not even get through an entire day of cutting with the non-Fusion blades. The OEM blades also cut the best. The Ferris blades are expensive and we haven't found anywhere to buy them at what we consider a reasonable price. We can get the G6 blades for about $15 each shipped if we buy enough of them at one time, but it seems the Ferris blades are closer to $20 each.