I bought a pneumatic elevating stool at Princes Auto ( similar store to Harbour Freight) It had a load rating of 400 lbs, since I am at 185 it should last forever but two days and the elevating piston pooped out, dropped to the lowest position with a real thud, never to be elevated again., My costco stool shows seat wear but it is at least 8 years old but it became uncomfortable so I found an old office chair with arm rests, swivel seat and hieght adjustable that I now use for scrolling, very comfortable and on occaision I use it to lean back and take a nap.