We have a low shag carpet and this is too weak to hold its form. Dimples are starting to form and the chair is becoming difficult to move. This might be good on very low tight pile glue down carpet that you see in office buildings but don't use it for your home carpet.
I weigh 155 and have a standard size chair. The mat is quite thin and the wheels of my chair leave pretty deep impressions and doesn’t easily move when I need it to. I would not buy again.
It works okay on my berber carpet. My chair had already made indents into the carpet so with the mat on top my chair tends to roll to where the indents were.
I needed something to protect my carpet while I am temporarily working from home and this fits the bill. If I were going to work from home on an ongoing basis I would spend more to het a better one but this will do. It is already getting "Dimples" from the chair wheels but it is doing the job and the price was easily affordable. I would recommend it.