The vinyl chair mat does the job but even after short term use you can see depressions forming. It will not last beyond a few years but if that is good enough for most people then it is fine. It does work well in allowing my chair to move over a carpeted floor.
At my office my desk chair was located near my desk but had to be pushed backward forcibly due to overlapping carpets. I was manually lifting the chair. So we went to Staples to shop for a plastic mat. A very helpful sales person found us the perfect size and solution. Now my chair moves smoothly. I recommend the use of this product. Thank you Staples!