So far so good. I weigh 218 pounds fully clothed and this chair mat is holding up quite well under my 5 wheel desk chair. I can recomened it. It came somewhat folded but after laying it out in the backyard under the sun and on concrete for a few hours it became flat as a pancake.
For a heavy fellow like me (230lbs) it has developed small ruts where the chair wheels usually rest. It requires effort to move out of the rut and effort to keep it from sliding in. Shifting the mat placement has helped but now new ruts are developing. Should have bought a thicker one.