Works ok. If you sit in one place for a long period of time the wheels on the chair sort of sink in making it a little difficult to move. At least it isn't cracking like the one I had to replace.
So far this mat is doing great. It doesn't slip and my chair rolls smoothly. I do wish the piece that goes under the desk was a little larger since I do roll off the mat on the front end however that is only a very minor gripe. The last mat I had cracked very early on (it was purchased in-store folded down the middle). First it cracked several times down the middle seam then over the next year developed micro-cracks all over. So far this new mat is holding up well without a single crack (about 2 months in)!
My chair cause divits in the mat after only sitting in the chair for 10 minutes. They have not come out. Everytime I sit down in the chair it caused more divits then you can't move your chair. I got frustrated and threw the thing out and purchased another one.