our previous mat had permanent holes in it that caused the chair to be immobile. The new mat is much harder and we anticipate that the same thing will not happen to the new mat.
I like the mat very much. It has worked out very well. The only issue is the label that was glued to the top surface was difficult to remove and left discoloration on the area where it was attached.
This mat was delivered the next day after order was placed. It has performed well since that day. The "cleats" are deep enough to keep the mat from sliding. However the wheels of the chair create depressions in the mat which prevent the chair from sliding freely. After the "body" weight is off the chair the depressions go away.