When I sit for any length of time the wheels of my chair create deep impressions in the mat and my chair gets stuck. I weigh 170. I did not have this problem with a previous mat. When I am not using the mat the impressions do fade but never completely.
I bought this to help my aching knees from constantly trying to push myself around on carpet and it doesn't appear that it will help much. Rolling around on it takes almost as much effort as it does on the thin carpeting we have. It arrived in a roll and when trying to remove the tape holding it together it left behind a lot of the gum - so now my feet stick to it. Definitely not happy with it.