I love these precut sheets, you don't have to grab a roll of parchment and pull and cut it and hope you get a straight cut and the correct size. They fit a standard cookie sheet and larger cookie sheets, I also use one to line my 13x9 brownie pan so I can pull out the whole pan of brownies after they have cooled for easier cutting. I wouldn't be without these.
I am sure your parchment sheets are high quality, like King Arthur, but your shipping charges are less! I am looking forward to using sheets, instead of a roll of parchment, that is impossible to flatten out.