More recently I tried using one at my parent's house. My mom doesn't cook very often, doesn't have many pans and all of the ones she had were in use except for that one. I was heating gravy from a box and once again, it burned.
I should add that I am not one of those people who burns food very often. Once in a while my rice will get too dry and it will stick a little to the pan. I did get rice burned to the bottom of the pan once. And occasionally I will burn a few pieces of popcorn. That has been all in the past probably
20 years or so.When I was younger I did burn things a few times. I can't remember the particulars now but I do remember using a method that I read about in some book. Cover the burned food with baking powder (quite a bit of it) then water then bring it to a boil. Let cool and most of the time the burned food will scrape right out. Once in a while you'll have to repeat this. This method has never failed me.