I asked my spouse how it was working for him and he didn't even realize it was on the office floor. So it's working well. Protecting the wood floors. I'm happy.
Needed a new mat for very thin carpet squares glued over concrete. It works fine. Just enough of the little nubs to grip the carpet. My only issue is that if I sit still for a bit the chair sinks into the mat leaving small depressions. I am a smaller person and the chair is fairly lightweight. It sometimes take a bit to move the chair out of the depressions. I have only had the mat for about a week but the mat does seem to correct itself over a few hours. I am not sure if the results would be the same for a large or heavy person or a heavier chair.
I'm not very heavy (170lbs.) and my office chair has five casters so the weight is well distributed. However the chair still sinks into the surface when used on a medium pile rug making movement difficult.