I've been buying these for years. They work well and last a reasonable amount of time. I use them over carpet so I have to replace them about once a year.
We wish it stayed instead of moving away from in front of the desk. My husband is handicapped so he has to get my help to replace it. He is an author so is in on the computer most of the day. I liked it was easier to originally put down. No prickers on the bottom.
My office chair sank into the soft plastic and couldn’t roll freely. Why it’s marketed as being for “Extra Carpet” is beyond me; I can’t imagine it working on anything but hard floors Returned it the next day and Staples took it back without any hassle.