I find I have to replace my chair mat about every 3-4 years as the new ones just don't hold up like the older thicker/stiffer ones they use to make. Still it does the job.
We had carpet squares put in our new offices abd my chair stuck to one spot like velcro. It flipped me sideways and I hiy my head on the metal table going down. With this new chairmat I feel safe and have no more problems with my wheels getting stopped by the carpet and I won't have to go take riding lessons to keep from getting thrown under my desk by an unruly chair with an attitude. I think everyone who has a chair that has qualified foir the rodeo ought to get one or two for their desk area and a spare just in case.
Is flimsy w/ its support of chair allows grooves from wt of chair which causes wheels to roll back into them. Protects carpet for now but how long until grooves crack?