After less than a year this mat started cracking and only got worse. I patched it with clear duct tape which helped for awhile. I know it isn't the top of the line but I was hoping by paying a little more that it would last at least a few years but that was not my experience.
I bought one of these for my sons room and one for my home office. It is great to protect the carpet not only from the chair rolling upon it but to keep dirt and spills off of the carpet too. It makes the chairs very easy to roll and stays put on the floor. It fits under the medium sized desk perfectly but does not go very far under the smaller wooden desk....still works though!