For the price the mat if fine. The chair wheels settle into the mat making it harder to roll.If you spend a lot of time working at a desk it would be worth spending the extra money for a more solid surface.
I am a 300 lb person who spends alot of time in front of my computer desk and my four roller chair glides easily and matt does not crack. Good investment for me.
This is the second time I bought this mat and I had the same experience both times. It got multiple cracks after just a few months and actually cut my foot in 2 places. I will NOT be buying it a third time!
Chair rolls on it quietly. That's a plus after being in offices where the mat under your chair makes it sound like a freight train when you move around.