I bought this to replace one that was cracked and my chair wheels kept getting stuck in. Although this has no cracks the chair sinks into a location and won't roll unless I stand up and take my weight off the chair. I don't recommend this one. Worth the extra money to get a firmer one which will allow your chair to roll on it.
We needed a new mat as our old one was ripped and our chair caught on it when we moved. This was the best price we have seen and fits my computer desk opening perfect. Well pleased.