used top of line previously and cracked discolored left pieces all over carpet after a 2yrs. I am 128#'s and this leaves dents but rolls well. If I have to replace every 2yrs...it's worth it. Too soon to say how good it is right now. Only had 2weeks.
Used at home office which is adequate. Would not be sturdy enough for daily use of 4 or more hours in an office situation. Pleased due to the low price that I paid.