Silestone is TOTALLY non pourous. The other advantage of Silestone is you can put a hot pan on it without the surface melting (Corian) or the possibility of a fracture (Granite) Silestone has all the advantages of Granite and Corian with none of the disadvantages. The only thing that you could call a disadvantage is that the stone does look uniform in pattern, and not natural, if you look at it closely. But its a very hard, high tech surface, made of pure quartz. Its in our kitchen, we love it. EDIT: I see Rachel has talked about this already.