We had to put screws all around the mat to make it stay flat and not curl. I tripped twice before we put more screw in than the 2 holes that were provided. It cut my toes each time. We had to put 7 screws in to get it to lay flat.
The quality seems fine I have it under a standup desk. I probably would have given it 5 stars if the delivery person had worn a mask. Just trying to protect my employees.
Nice Price. Material is not as strong as other units. Thought it would do the job butt is too thin and the wheels sink into the mat which is over the carpet. Probably will not last .. I need a piece of panelling in place of this mat Half of large sheet will do.