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.