I weigh 88 lbs.  I am not heavy enough to get stool to adjust. Stool was easy to assemble, but lower connection is made of plastic.  Seat came damaged on one unit, but procedure to replace this single part was very straight forward via the web site.  I will feel better about rating this item when I receive the replacement seat. 

I received my replacement seat 11/2 right on schedule.  I would now change my rating from three stars to 5 stars.  Although I still can not adjust stool my self (weighing 88 lbs.), I always have my husband to help me.  He weighs plenty enough to adjust.