Bought this because it was a little thicker than most. Sadly it is so soft that just sitting there the chair wheels sink into the mat. When I move the chair the indentation slowly returns to normal. (I weigh less than 200 pounds.) Other than that it stays in place and the chair will move around as expected - once you get it out of the "hole" it created while sitting. For those who wonder it arrived unwrapped/"flat" - so soft it easily bends.
It functions as excepted. The chair wheels settle into the plastic which will lead to an early death but that is typical of carpet chair mats. The grippers are better than before. They do not dig into your hands while placing or moving the mat.