I have a 1/4" pile carpet and the casters from my desk chair sink into the mat and make it difficult to move the chair. That is precisely what I was trying to avoid by buying the mat!
I'm using in a home office on a low pile carpet. The mat does not slide but effectively lets my chair slide while protecting the carpet. Wonderful price ... Wonderful value!
I purchased two for the office just for the high traffic areas where the chairs tend to move alot more. Every time i get close to the mat the corner tends to ride up alittle and well there i go falling on to person next to me.