Product review (5 stars): Great for me
I love these.  One of my few luxuries in life.  I refuse to scrub drip pans.  I get several of these and when they get nasty I toss them.  Foil liners do not work well and they are expensive.  I suppose if one scrubs after every use, they would last longer, but I have a heavy workload and, as I said, they are one of my few luxuries.