I very much like this puzzle mat, it has allowed for a quick and easy cleanup of the table I’m using if it’s needed for something else.I tried a few different methods to test this mat. I built a 1000 piece Ravensburger puzzle to completion and then rolled the mat up. I walked around my house with it and move it different directions so there was a lot of movement. When I unrolled the mat it was almost completely untouched. I had to press down a few spots, but there was very little movement.I decided to do further tests so I put most of that completed puzzle away in the box, maybe 2/3 of it and left the rest on the mat. I evenly distributed the pieces and left a large piece completed. I noticed that if one side of the mat had more pieces laying on it, the roll up was uneven, like a cone, so I adjusted where the pieces were, made sure they were all face up and tried again. I rolled the mat, which was a much more even cylinder after redistributing, fastened the straps and started testing!I walked with it hanging from my shoulder, stood the mat on its end and dropped it on to a table in both directions, tossed the mat from one hand to the other and tipped it from one end to the other. The results are in the photos. There is a before and after labeled. There was some movement but not a lot, the large piece stayed intact. The worst that happened was some pieces stuck to the rubber backing when unrolling. I tried to unroll slowly too.As far as puzzle mats go, this one is pretty darn good. I have a white cat so, I used a lint roller to remover her hair if she decided to “help” with my puzzling.The middle crease that occurred while shipping is likely never going away, but the bump isn’t so bad after leaving this mat out for a few days.I would highly recommend this product.