it is for lighter usage...but I use a rolling office chair on lower pile carpeting and it works great. It could be thicker because it does indent when your chair rollers stay in one place for awhile...but does seem to rebound after a time. Compared to the other expensive choices I think this is a great bargain. If it wears out I could by 3 for the price of the next price range at Staples.
I bought it to support a slide-out table in a craft cabinet. It does a really good job of letting the table slide out smoothly while protecting the carpet from wear and tear.
I work in a high activity workplace lots of hustle and bustle and chair movement. Our floor happens to be tiled with deep grooves for the grout in which our office chair wheels would get stuck in. Very annoying. Other chair mats we had would slide all over the place making them a safety hazard. This one sits in place actually nice to walk on (softer feel than tile) and so far provides a smooth rolling surface. The large area allows for not sliding off any direction I decide to roll too which is even better. Go big or go home!