The mat works well under a desk chair with casters sitting on a carpeted floor. It protects the carpet without leaving irremovable imprints in the floor. Best of all the mat was on sale and I got a very good buy.
Returned product--not as advertised. the product numbers matched but ours had the bumps on underside which would scratch flooring--flimsy and rolled up--was expecteding a smooth hard floor protector
I've only had it a couple weeks and it seems to be doing well. I am a big boy. My weight will certainly put it to the test. It is on top of thick cushioned carpet so if it works here with me it should work for everybody (normal people).