Any machine is worth cleaning up and adjusting the stitches. If it sews well and you need a back up, keep it. If it sews well and you don't want it, gift it someone who needs it on Freecycle. I was given a 533 in a cabinet. The ZZ is broken, but it sews a great SS. My 13 yo GD made her first quilt on it and has taken it home. My son she couldn't take home until it jammed and she learned to fix a jam. The machine NEVER jammed.