Product review (1 stars): Won't Lay Flat
First: When I opened the box I saw that they were folded in half to fit the box.  The issue is that one side has a crimp or crease in it and even after a week of laying flat it is still creased and won't lay completely flat. It kind of defeats the purpose of preventing spills from running down the inside of the range and countertop.  I ran it under hot water hoping that might help but it didn't.  Then I used a hair dryer to warm it up.  Still has the crease.
Secondly: They are so glossy that it almost looks like black duct tape. So aesthetically they aren't the best looking gap fillers. I can live with that but not the crease.