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.
This is the 3rd mat we've bought. We have pine floors in our house and don't want to risk damage to such soft wood & these mats are a great way to do that. The only reason I can't give them 5 stars is because of the need to air them outside for a few hours due to the "off-gassing" with new mats. I had to drive home with the car windows open and then leave the mat outside until evening and even that didn't completely get rid of the smell of new rubber mats. Aside from that these mats do protect the floors from the chair wheels which is why we bought them