Mat would not lie flat after removal from packaging. I placed it outside in direct sunlight for several hours to soften it enough to remove most of the warping. Even after several days useage it still does not lie completely flat.
Bought the mat to go with an executive desk in a low-pile berber carpeted office. My executive chair is large and just so long as I don't move around too much it's good. In retrospect I probably should have gone with a bigger mat and custom cut it to my liking/office layout.
The grippers on the bottom are not long enough to hold to the rug. It tends to migrate toward the desk leg then bunches up and then does not lay flat for a couple of days. I would not recommend this product.