This mat is excellent. My chair rolls on it very well. It is thick enough that the wheels don't cause depressions that require effort to get out of. It doesn't slip either;the cleats really hold on my medium-pile carpet.
The chair mat that I purchased is extremely soft. It conforms to the chair rollers making it difficult to move. I would not recommend its use with plush carpet.
I only weigh 145 lbs and the floor mat only seems to last 1 year. I don't know what the longevity should be but I feel it should last longer that than before cracking and breaking.