This mat is extremely well built and much thicker than other models purchased. I have older shag carpet and experienced many problems with other mats. This mat lies flat and is adequately secured to the carpet with small plastic spikes. I am extremely pleased with the design and am confident the mat will last for many years to come.
I'm not that large of a person but after just 3 or 4 minutes depressions form under each of the chairs rollers that are difficult to roll out of. The price was attractive but turns out to have been a waste of money.