The casters continue to fall off.  If I move the chair or sit down on it, they splay from the column on which the seat is placed.  I've had to take them off.  Also, the instructions do not adequately prepare the person trying to put the thing together for the process; when a screw came loose, I was forced to solidify the part that connected the back of the chair to the seat with gorilla tape.  This product is not well made and hard to use.