The mat shifts as a result of moving the chair around. I have only had it a short time and it already has areas that are wore which cause the wheels of the chair to stick in the worn areas/grooves.
We have several of these mats in our office and have to replace them quite frequently especially those that are on carpet. I'd like to see a mat with a longer lifetime since they're not particularly inexpensive. Pros: protests the floor as promised Cons: doesn't last long so we've had to replace multiple times
While the mat doesn't quite work with my L-shape desk (the smaller part doesn't quite fit far enough under the desk to protect the carpet where my feet sit) it is a sturdy mat that looks like it will hold up to extended use. It has also stayed in place on my medium pile carpet and not moved as I have rolled around. I have a fairly large and heavy chair and the mat is not developing any grooves or dips. I hope it will hold up to my first impressions!
I spend a lot of time in my office. I have worn out 2 rugs and decided it was time to protect my rug. I looked at several mats online and in the store. I decided to go to the store and purchase one. They had a colored mat but I decided on the clear nuetral mat for my office. It does everythind I need it to do and was a good price.