My chair rollers sink into the mat making large craters making it difficult to move the chair. Cheap price was attractive but it's a very cheap product.
I buy one of these from staples every 1 to 1.5 years. They break apart. Supposedly there is a one year mfr warranty. A more expensive 3 year warranty on heavier gauge mat is available; however no one in the store knew anything or had any documentation. It was not in the computer as a clear policy statement. Not up for the glass mat and want to protect the flooring so stuck with a disposable chair mat.