Chair mat is alright but the wheels tend to get stuck on it when using with carpet. If the back wheels of the chair come off the mat they get stuck and you have to get out of the chair to put it back on the mat. Would not recommend.
I have a corner computer desk that sits on carpet medium plush. I HAVE to have a chairmat or the carpet would be ruined & I would not be able to roll my chair! This does the job.