Turns out it's a little hard for my chair to roll on. I'm heavy so that's part of it. It seems to be fine quality. I should have investigated the thickness some more I guess.
It was a bit difficult to tell what I was buying and required getting help to match prices to multiple products. With staff help I made a selection which turned out to be about right in size. I hope it will serve my needs.
I'm only at my computer a bout 30 minutes a day so I'm not rolling a round on it that much. I'm sure it will last me a long time. I'm perfectly happy with it.