It seems fine and just what I wanted. Can't say it is the best I have ever had since I have never had a chair mat which does not work--they just eventually get rutted. But this one is working well.
I've bought this mat before and it's the one thing that every home office needs. In time the plastic will start to crack and break but that's probably a good 10 years down the road. Since most people get complacent about vacuuming and cleaning "office" carpets be aware that the mat will leave a distinguishable mark in a couple years depending on the amount of foot traffic.