I've been running the Dayco XTX for a couple years now on my M800s. I'll never go back to an OEM Cat belt. They are way overpriced and just don't perform. Plus the XTX has a one year warranty, break it within that year and Dayco will replace it for free, just pay $10 for shipping/handling. So for the cost of $119 from Bikeman Performance for one XTX belt, you basically get two belts. Mine have lasted anywhere from 600 -1000+ miles for me depending on the sled it's on. A mix of hard mountain riding and/or trail and ditch riding.