Product review (2 stars): Good intentions
My mother-in-law has similar Pfaltzgraff steel burner covers and hers work great.  She bought them in the store, so she was able to look them over first.  She has turned the eye of the stove on with them still on and has not burned through them yet.

We however bought this product through Amazon and they arrived severly damaged and had to send them back.  We were refunded all of our money, so it was not a total loss, but I am afraid to order them again.  We ordered two small covers and two larger covers. All four were seperately damaged.  One had a huge chunk taken out of it.  I would buy it in a store if possible to make sure it isn't damaged.  Our store closed down so I have not been able to find them, but I'm still looking.