i aslo have had a chip, about half a centimetre appear in my new (sniff...) belling ceramic hob.
I am guessing that it happened when some burnt food on the bottom of my pan made contact with the surface.. but that cant be reason enough, I have been using glass hobs for years and never seen such an easily damaged surface!
i suggest that if others have had this problem that they add to this forum. it is the only way you can build up a strong enough argument against belling.
I will check this forum every couple of days to see if anyone is googling this topic
matt h
February 2010