I would question the re-built info. how far did they go with the rebuild..? Is the brush roll worn.? Is it new.? Has the motor been totally rebuilt like new bearings and brushes.? Is the armature worn.? Is the bag still like new.? Is the motor fan ok.? Have a good look at the cord and plug.
But then again when you buy online it's Buyer Beware....!!!!!!! Good luck.....