My carpet was too thick for this mat to handle. It immediately developed 'ruts' from the chair wheels and it became difficult to roll freely. I would recommend spending a little more for a thicker mat. The economy mat is not worth the day-to-day aggrivation of not being able to move freely.
The mat dimpled pretty fast but the people using it aren't the smallest either. It is adequate for what I am using it for and I think it will last for a few years. I would buy again.
I was surprised at how quickly ruts formed from the rollers of my chair in a new mat. It's much too thin. I'm still having to exert a lot of energy to get outof the rut. My old one had cracks/holes that required the same. I thought I was making an improvement but it isn't much of an improvement.