The chair mat is a bit too soft. Chair wheels indent a bit making it hard to roll. Mat is being used over a medium pile carpet. The mat may not be well-suited for my application.
Chair mat is too thin to be effective. Leaving chair on the mat overnight resulted in dimples where the chair's wheels were. Might be fine for low pile office-type carpeting but I'm using in home office with household carpet and it just sinks down too much. I cut 2 ply cardboard to same size as mat to place underneath and that seems to help but it's not very attractive.