I find this mat to be functional and durable. It stays in position as needed due to the corrugated points on its back. The four-legged chair on it slides smoothly on the top surface. It stays in place on the carpet it protects quite nicely. Recommended as a very good value for the price paid.
Love my new floor chair mat that protects my carpet in the office. It was affordable the right size and just what I needed AND it was delivered right to my front door.
The mat itself is nice and the 'teeth' underneath keep it in place on the carpet. This is probably a function of the wheels themselves sinking into the mat + carpet; there are some indentations in the mat from where the chair is stationary/when I'm sitting in it. Not sure if that can really be avoided though.