I been testing for almost two months a different bed glass called Neoceram as an alternative to the UM bed glass, so here they some my impressions and 'why'.
Neoceram is a Ceramic infused glass made by a Japan company. Is a glass designed to withstand up to 800C heat impact. Why it can do that? That's one of the interesting things. The Neoceram glass doesn't 'Expand' when it heats up, it doesn't change of shape when heating up, so it doesn't break, chip, or get damaged by heating/cooling.