this review title is: do not be hasty in assembly pay attention and the content is: when assembling align the center post carefully into the base or it will be crooked and the seat will not be level all the time once the center post is inserted into the base you cannot remove to re align at least i could not remove it however it rolls great the seat is a little flat should have a little more cushion but it works.there are other information for this review, one is this reviewer did purchase it and the other is 0 people think this review is helpful.