Imploding glass hob

Do not buy this product. It's dangerous. For the first time I used three of the rings simultaneously and within ten minutes the whole glass hob had imploded - thank God it's safety glass otherwise I dread to think what would have happened. Unbelievable and now I have face the whole job of trying to get a replacement. I will be insisting on a stainless steel hob now. I have never seen anything like it and would advise against any Cata hob.