I've only had it a couple of weeks. It APPEARS OK but already I've noticed it crawls or creeps across my carpet and I have to keep moving it back where I want it. My old one didn't creep. I have no idea how long it will last. The one this replaced was aqbout 4 years old and had a lifetime guarantee. That's why I bought it. When it cracked Staples said the manufacturer no longer honors that guarantee and returned my full purchase price less tax and shipping. I took it. This one is supposed to be for 3/4" pile carpet which is what I have but I noticed it is "thinner" than my old one so it's anybody's guess as to how long it will last! Until it cracks I guess I have to be satisfied with it.
Overall a great product - makes rolling the task chair almost effortless. Love the design of the cleat bars underneath which keep the mat in place but don't puncture your skin when you try to move it. The ramps on the edge also work beautifully for times when you need to move the chair elsewhere in the room. It was not a problem for me but the mat did have a rather strong plastic smell when first delivered. The smell disapates in a day or so - those with sensitive noses might want to let it air out in another room before installing it in their desk area. Overall superior to the name-brand mat it replaced.
This chair mat will work for awhile. If I had it to do over I should have paid for a more substantial mat. This mat is thinner than needed for smooth rolling.