Product review (1 stars): Oven liner melted to oven bottom. (Also smelled.)
After less than two months worth of VERY light duty, this oven liner is already in the trash.

History:
We have only used the liner from mid-January until mid-March.
We have a gas oven, and only use it once a week or so, for a frozen pizza.  (No higher than 425 degrees.)

Odor:
The oven liner produced a nasty odor when it was on--smelled like burning plastic.
It wasn't so bad that it stunk up the house, but if you got too close to the vent on the oven, it would make you cough.

Product failure:
In the time we've had it in the oven, it seemed to be performing it's duty-catching dripping cheese, etc. and keeping it off the oven bottom.
However, as we went to preheat the oven last night, the oven started smoking.
We thought it was just because we needed to clean the food off the mat, but when we tried to pull the mat out for cleaning, we discovered it had melted to the bottom of the oven.
By slowly peeling it out, we were able to get most of it out of the oven, but I will probably have to do some scraping to get the last bit out.

I would not recommend this product.