Perfect size for the "L" shaped desks we ordered. Chairs roll over it smoothly and stays in place. Have had them for 9 months and they are holding up well.
I was surprised at how quickly ruts formed from the rollers of my chair in a new mat. It's much too thin. I'm still having to exert a lot of energy to get outof the rut. My old one had cracks/holes that required the same. I thought I was making an improvement but it isn't much of an improvement.