My Computer chair was putting black spots on my Pergo floor so I put this mat under it makes my wife happy the marks are cleaned easier with the mat. Problem solved.
I've only had it for a month or so but works great so far. It appears to be good quality and clear so that you see the floor through it. It was shipped to the store very fast and came rolled up but it flattened easily and quickly at home. My chair has rubber wheels and no problems.