I use Stens and for the most part don't have any issues. Now on my Scag Tiger Cat, I've eaten 2 belt in less than 20 hours. These are made in India and only cost $30 each. I'm pretty sure they use to cost $45. The inside shreds and slings the belt. I noticed after reading bad reviews on Amazon, that the last 3 spares I bought were thicker belts. I have a Scag on order, and I do need to idler pulleys for the drive changed, but I'd say there's no way the pulleys would be responsible for what happened. I might have less than 600 hours on the Scag, but I torture it on the hills. I usually only get 100 hours on a drive belt.