I have run a lot of duratracs, none on a Raptor but on Dodges and Toyotas. My KO2s are getting louder with 20K miles on them, just like duratracs do. Pitfalls of the duratrac are weaker sidewalls than the KO2, higher price and a tendency to cup the edges on the front tires. Regular rotations help but they keep doing it... More than KO2s seem to, though I rotate those every 5k miles with oil changes too. Duratracs probably have an edge in the snow. My KO2s are about half worn and if they are anything like the KO's used to be they blow under half tread in the winter where the duratracs just keep on working with low tread. Not sure which I will go with next on the Raptor. If my low tread KO2s are not cutting it in the early snows I will probably replace them with duatracs.