It does not work on my carpet. Its more for a berber carpet but I'm not willing to pay upwards of $50 for a piece of plastic so I settled for one that is sub par.
Chair mat is shown on website as 60" plus a 12" lip for a total 72". The chair mat I received has the 12" lip but overall length is 60" including the lip. I can still use the mat even though shorter than expected.
It does exactly what it is supposed to do protecting the area beneath the wheels of my desk chair. It has the small plastic "spikes" that grip the carpeting.