Mat is too soft. While sitting ia chair on the mat, the chair wheels leave divits in the mat. Getting the chair to roll out of the divits is sometimes challenging. The divits dissappear overnight but each day the process repeats. A harder, less flexible mat is prefered.
I bought two of these for my office, which has hardwood floor. They are dangerously slippery. I have almost fallen several times, when walking across them. Be sure to buy either something to go underneath to keep it from moving,or some sort of sticky pads. But I would choose another option if possible.