I bought this as a gift for my husband who is not a heavy person - maybe 185. The mat has dents in it from when he sits in his chair ... at the space where the rollers are. The dents don't come back up and it makes it extremely difficult to roll back and forth. I would never recommend this particular product.
I should have listened to the review where they said the wheels sank into the plastic. It's just as hard to slide forward with the mat as it was on the carpet. I would not recommend this product. Product is too thin.
The mat is still pretty thin. I only weigh 90lbs and the chair still makes dents in the mat. It makes it difficult for me to move my chair up to my desk when it gets stuck in the dents.