I had a big Fibrament-D stone since 2005. A few months ago the damn thing cracked in half. I emailed the company and got a reply from the owner, no less. He asked for pictures. Upon receipt, he told me that I was the very first person to cite a failure out of the thousands that he has sold. Keeping in mind that the website touts the wonderful 10 year warranty, I thought he would back his product. Nope! He prorated me and said he would give a whopping $10 off on a new stone. What a guy!