This Chair Mat is too soft. I even purchased extra large chair casters to more evenly spread the weight. It did help. There are depressions on the mat and I can't slide along it.
I have worked in offices for a very long time and know the difference of quality. This is a good buy.I wasn't sure it would be as the thickness is hard to guess but it works very well.
Nothing lasts forever. This one lasts longer than others I have bought and is cheapest I have found so far. Appearance and function match those of the highest price. For best value buy on discount. My latest purchase was at 50% discount (about $15.00). I expect I'll get more than one year's use before replacing.