Bought a silicon baking mat yesterday. Wanted to buy a Silpat one but it's out of stock. So I bought this non-Silpat from a baking supplies store. It's great! I do not use it as a baking sheet as it is too big to fit into my oven. Anyway, the purpose of buying it is to use it to roll out doughs, so that I will not roll directly on my kitchentop and scratch it.
It comes with measurements for cakes as well as metric length measurements at the side. Definitely useful! :D