I've had these mats for well over a week now.   They look fine and provide a surprising amount of fatigue relief for mats that are pretty thin.  

I have two concerns with them.  My main concern is that they don't stay put on the floor.  The smaller one especially slides around, making it a bit of a hazard.  The other concern was that I really wanted one mat that was 6 feet long and heavier than these are.  I still am wishing that I had what I wanted in the first place.