The mat protects my carpet BUT if I stay in one position for an extended period it makes a rut and I have to pull the chair to move it out. When I bought the mat at my Staples it was the ONLY one they had on display. Later when I was at a larger Staples I saw 4-5 different mats on display. I will most likely upgrade and bite the bullet on this one.
What can I say. It's a mat. Helps to reduce traction against the carpet for ease and convenience. If you're looking you should just buy it. You'll be glad you did. (Mic drop)