Don't be distracted by the cheapest price. Know the depth of your carpet; if you get this one and your carpet is too thick you'll just end up sinking and defeating the purpose of the mat. Be sure to get the correct one for your carpet.
I purchased the version that was advertised as suitable for plush carpet. When in use the mat has developed dimples where the casters rest which makes it difficult to roll the chair easily. It should probably been thicker.
My chair rollers sink into the mat making large craters making it difficult to move the chair. Cheap price was attractive but it's a very cheap product.