This mat serves it's purpose. It was a little hard to unroll the way it was packaged rolled up. I was able to get it unrolled and laid it out for a couple of days to with a few weights to be able to put it on the floor under my desk chair. Now it is under my chair its fine and does the job. I have to be sure to move around my chair otherwise my chair will leave an indentation in the mat. It probably could stand to be a little thicker but otherwise it does the job.
Clear and smooth and wonderful but perhaps dangerous? Chairs roll easily on it... Maybe too easy? I'm considering fashioning a speed bump or two so my office manager doesn't have too much fun because work is for work. Would recommend for work not for play. And definitely not for using as a sled over fluffy white snow because you'd have to sit on it upside down and those pokey nubs would do a number on your hindquarters.
quite adequate for home office on tight knot carpet. Instructions are not correct in final step. The back cannot be laid flat as pictured and it takes two people to secure it. Very comfortable when finally assembled.