My mom bought this for me as a Christmas gift. I have to say that I really like the cookie sheet liner, it works as advertised. She also has a set and thinks it works like a charm, but when she made a meatloaf in the loaf pan, it stained. Same thing happened with my cookie sheet liner after baking can biscuits, 1st time I hand washed it and it stained. I washed it the 2nd time in the dishwasher and the stain disappeared and was as good as new. Just be sure to wash it top rack away from the heating element.
Hope that helps some.