Product review (3 stars): Watch out if using on high btu stoves.
Nice product but one fault. I have a Viking stove which puts out some btu's.  Slid the spacer in and it looks great, adhered to stove well. While boiling water I noticed it looked different. The magnet unglued from the side of the unit due to the heat from the stovetop. Looks like I have to buy some high temp silicone and adhere the magnet. Too bad, great idea.