Despite it being advertised for a medium-thick carpet the spikes are not nearly enough sharp and long hence the mat keeps dancing around the carpet - which is highly aggravating. Not a good product for the high price they charge for it. Wouldn’t recommend it.
After only a few days of use the mat is already dented by the wheels of the chair. I am 230 lb but my wife who uses a separate mat is much less and both mats are dented by the chairs.