I love my fibrament stone. It is expensive, but I was going through those cheap 20 to 30 dollar stones almost every other month, they just kept cracking. Since I got the fibrament stone 3 years ago not a single crack. Sure it was expensive up front, however it paid for itself about about 3 or 4 months.
It works well in my oven also, the conductivity it where it needs to be for my pizza's to finish cooking on top without burning the bottoms.