The whole best thing was that it was delivered the very next day!! I had expected to wait a week.While I liked my old mat better [seemed to anchor in the rug pile better] old mat was getting rips in it -- after 5 years. Got help anchoring it under computer desk and my chair is sliding on it real well.
I'm a 230 lbs person and I have not had any problems with my office chair sinking into the mat on old carpet (3/16" of pile left). I have been impressed with the stiffness of the mat but not the cleats on the bottom as this mat still moves about an inch each week after 40+ hours of use. Hence the 4 stars.
I have a 7-caster cutting board topped cabinet for sewing/quilting lots of moving extension legs cabinet doors all on small caster wheels. Just wasn't working on the carpeting. This mat is the perfect size stays in place on our 1/4" wall to wall and allows the cabinet to now function properly. This is reasonably priced good design great solution.