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.
As received this mat emitted toxic gas. Placing it in direct sun for a day has eliminated the problem [SO far).. The mat should never be in the house or offlice after unpacking until the described sunning is done. Otherwise it is good so far.
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.