I have three pairs that I rotate, and all are pretty much in the same shape. I play/practice 3/5 times a week and the shoes are about a year and a half old. I am wondering how you know when your shoes are shot when you play on clay all the time. The soles are still fine, but I've got some internal wear through in a spot or two. They are still supportive, but I suspect they don't offer as much cushioning as I would like. How do clay court players know when their shoes are shot?