A friend bought a set for his Kubota SVL 75. We installed one to replace a torn OEM track, and left the OEM on the other side. The Mclaren seem to wear much faster than the OEM, and they are chunked badly in just 150 hours or so. When turning on concrete, there is rubber all over the place on the Mclaren side, and hardly any on the OEM side.
Right now, with about 150 hours on the Mclaren track, it is in far worse shape than the OEM on the other side with close to 800 hours.