Product review (1 stars): Bought 3 sets.  All three defective.
These are very poorly made.  I have now purchased 3 sets of these drip pans,  and all failed.

I am not sure how long the first set lasted.  I purchased and put on my stove, and went on an extended trip.  I had a house-sitter (who was extremely careful and clean with all other items in the house) and when I came home, one of the pans had the finish chipping off and showing about 4 inches of the black material underneath.  I figured she had dripped something hard on the stove, but now I'm thinking she did nothing wrong.

I ordered a second set to replace the chipped pan.  One of the four pans arrived already chipped, with a chip over 1 inch long.  Returned, and ordered a third set.  It arrived today, and sadly, one of the pans was again chipped.  This time the coating has already flaked off along the rim of the pan, over 6 inches long.
These are not minor defects, anyone could see these from across the room, and the defect is along the very top of the drip pan, so it's not hidden at all under the burner.  The whitish enamel coating seems to be very brittle, and my guess is that the slightest bump (or perhaps even scrubbing with a little effort) will cause this again, and again.

It's too bad, because they fit my stove perfectly, and the ones without flaws look gorgeous.