the mat is probably fine for berber or short-hair carpet. I had it for thick carpet and it is not working well. It keeps moving and I need to adjust it daily
The mat was easier than I expected to unroll and lay out flat. I needed gloves however to keep from hurting my hands on the spikes. The mat looks good and protects the carpet well. However the plastic material is quite soft and the chair does not roll easily on it. The wheels simly press the mat down into the carpet. Part of the problem may be that my carpet is too plush for this type of mat. I have a couple of hard plexiglass carpet pads which work fine for rolling but they slide around on the carpet. I thought your mat with its built-in plastic spikes would solve the sliding problem and it does. However the material is a little too soft at least for my carpet and I would prefer a harder material (but not as hard and slick as plexiglas). Maybe you'll come up with one in the future.
This is the second mat of this type we have purchased from Staples in the last five years. The first one cracked in the middle where the chair was rolled to and from the desk on a daily basis. Each day it was in use for business from 8:30 am to 3:00 pm by the administrative assistant for the business which was run from the home. The rest of the time it was used by the family of three who lived in the house including a young child and her friends while they played games. I believe the cracking was due to the weight of the adult during the day and two children or one adult plus a child using the chair during the evening hours.
When this mat said it was for only 1/4 inch carpet it was actually stretching. This mat is so light weight that it does not give a firm surface for a roll around office chair. It was a waste of money. I am sad I spent the time and money to purchase it. I am thinking about returning it to the store. Not very useful in my office.
These mats are pretty sturdy and plenty big. They're billed as "limited lifetime warranty" and I had one that developed cracks. Staples replaced it and I now have a new one.