Product review (1 stars): Warped and Melted!
The first time I cooked with this on, one of the sides warped, but I was able to bend it back a bit.  The second time, the magnet started to stick/"melt" to the stovetop and pulled away from the further-warping plastic. (There's still a bit of melted magnet residue on the side of my stove!)  This is NOT appropriate for actual use on a stove-top while cooking!  Maybe for looks, but not for use. WASTE of money!  (Wish I could rate it 0 stars.)