After just 5 pizzas and 3 uses, the stone has warped slightly and is severely discolored. Everything sticks to it and it is very hard to clean.This stone is very porous (which is why it is so hard to clean) and not very dense at all. My suspicion is that it retains far too little heat. I am not impressed with the way my crusts have turned out.I have used a pizza stone in the past that I felt did a better job.