I replaced mine this spring. I posted a topic on it with photos, but the search function doesn't work for me. Like mentioned, most all of us will have a few surface cracks ... it's the deep cracks and or total failure that's the issue. It's pretty easy to swap them out. I was sent new ones at no charge that were a bit more dense (higher durometer number) than what the factory installed. Here's a shot of the one that failed. The cracks underneath aren't the issue ... the separation gap top left hand was the actual failure.
