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.
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.