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.
If it is not on a "hard" or firm surface it will flex too much. If the carpet has any pile you get divots in the mat and the wheels sink in. It too thin for long term use on carpet.
I have a corner computer desk that sits on carpet medium plush. I HAVE to have a chairmat or the carpet would be ruined & I would not be able to roll my chair! This does the job.