Having used this for almost a week I am still adjusting it. It tends to move and the more narrow end wants to curl up or not stay flat on the carpet. My chair does roll easily on its surface so that's a plus.
A 200lb weight on a 5-wheeled office chair is too much for this mat. It does protect the carpet from the deep wheel marks; however the chair wheels create depressions in the mat. Hindsight tells me I should have opted for the heavy pile carpet (I am currently working on ~3/8" pile carpet)
This replaced an old and thicker chair mat that developed holes. It fit neatly up to and under my desk and my chair rolls easily on it. I like that it's thinner and yet still provides the same smooth ride the older and thicker one did before it started to fall apart. I expect it will last many years as the old one did.
They are difficult to roll on. Yes I do have short-worn-down pile and didn't want to spend any more than I did. However being a secretary all my life I do know that heavier/thicker chair pads were available. These were super for rolling any size office chair.
This artist's studio now sports a neat sturdy and compact large floor mat to protect the broadloom when the painter "tears loose". It's a lot nicer than an oil cloth! Economical enough so that it can be replaced when it gets too covered with paint droppings. The cat loves it too!