Thought for the few hours I sat in my chair this mat would work. My desk is on low pile carpet but the mat still gets grooves making it hard to roll the chair. Will use it till it's not use able then get the correct one for the carpet!
This mat is on a medium pile carpet. It immediately developed "dents" under the chair wheels. I have had it for only about one week so I do not know if it will develop any other weaknesses.