I have had issues with cheaper mats and my chair wheels digging pits into them specifically bought this to avoid that and I'm ready to throw it in the trash after using from New Years to mid-April. It gets a lot of use but I weigh 185lbs would think that it could handle an average-ish weight but nope.
Good chair mat for my medium pile carpet. I move a lot between 2 computer systems and this mat makes for smooth chair rolling. Not sure about long term durability but so far so good.
Good chair mat works with worn carpet my carpet is almost to the bare floor and it sticks very well. I wish it could be a little larger by 2 inches all around but OK so far.