I didn’t really have many expectations for a mat but this one is subpar. I’ve used the mat for 8 days 8 hours a day at 130lbs and there are dips in the mat where my chair legs sit.
Have an oriental overlaying wall-to-wall carpeting (a relic) and desk chair was always sticking. Don’t know why I waited so long to get the chair mat. It really helps greatly and enables chair movement freely.