At 1650 hours on the Kabota SVL-90 when we replace the original tracks for our landscaping company. We purchased these tracks in June from United Tracks and had them delivered to job site and installed at the end of June .The machine now has 1,920 hours on it. Same use as before however these tracks are completely shot. Chunks of rubber falling off everywhere. Not sure if the rubber compound was defective. Little under 270 hours of use and we are having to buy new ones. Customer service and shipping all went very smooth . But needless to say I'm very disappointed in having to spend another $3,500. We'll probably be looking a different direction on the next set next week. Unless the company is willing to figure out some kind of warranty or exchange