Product review (2 stars): came bent, won't lie flat
It arrived with a damaged portion that looked like somebody dropped it on its side from about 10 feet onto concrete, so they need to work on their shipping packaging.  I straighteded it out with some pliers but upon resting it onto my flat glass top stove, it wouldnt lie flat because of the wooden handle.  I suppose it is not made for glass top stoves but when I saw gas and electric ranges in the description my thoughts were "My stove is electric" and didn't explicitely say "not for convection stovetops" which other heat diffusers specified.  So perhaps they need to specify exactly what type of electric stoves it is and is not good for.  I attempted to remove the wooden handle so this thing might lie flat but it is on there too good and this thing was too cheap to bother returning.

I cannot physically use this diffuser to test its durability, it was packaged poorly and damaged on arrival, the company doesnt specify its applications... I cannot recommend someone buying this.