These come out warped pretty bad while they are hot. They do indeed warp and i never reach temps above 450. The pan is not 12 inches.
Dividers can be used as a plate to reheat pizza in the microwave. Can be washed in the dishwasher and can be microwaved. I usually throw the leftover pizza in a ziplock bag and it ends up all smushed and the toppings get all over the place.
Not as good as advertised. I love the collapsible container but the dividers tore the toppings off every single slice. The lid is useless you cannot snap the top to the bottom.