It's too flexible. I weigh 215lbs and when I'm in my chair on this mat the sides come up off the carpet and stay that way sometimes becoming a trip hazard. The chair's wheels also sink into the mat somewhat making it hard to move.
This mat comes in a box rolled up. Unrolling it should be on funniest home videos. I am now ordering the more expensive one that will work. Don't order this one.
I've ordered these over the last 10 yrs for use on low pile commercial carpet. Here's the thing these are cheap but crack in 1-2 yrs depending on the users' weight. But since $130 mats crack in 2-3 yrs as well at $30-$40 each these still offer the best value prop. Average lifespan I've seen is about one year is you weigh 200lbs (like me) and 2-3 yrs if you weigh 125-150lbs. If anyone experiences a 5 yr life on more expensive Quill mats please post it because I'll definitely give them a try!