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.
I thought that the mat would be more substantial than it is. The wheels under my desk chair cause indentations in the mat and cause some problems with the movement of my chair. I should have bought a mat of greater substance.
Nice inexpensive mat for a home office. However seems to "dip" where the chair wheels even for a short period of time. But does the job for easily rolling the chair around over the carpet.