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.
Extremely poor quality. Would not lie flat despite resting heavy weights on it for 4 days. Flexes too much under the chair wheels (I weigh only 145 lb.) Expensive given the quality.