The only negative I have is: the mat was taped for shipping and the sticky residue attracts soil and looks nasty. I would recommend the mat to a friend but would caution them to work on the tape residue before walking on it.
This is a good size and chairs roll easy without the noise. Almost forget that we use them at several workstations in our office. Be sure to let them "air" out before use.
The carpet chair mat is a good product. I would not recommend it for thick carpet as the weight of the chair and individual will sink into the carpet. This results in the chair not moving easily. If you have shallow carpets then this is the mat for you. The mat is great quality and will be great in an office.