I have not seen any used ones without one or both of a very common problem with these models. The plug on the bottom of the motor unit that connects with the prongs on the base to get power to the power brush motor is always shorted out. And all the motors are very loud due to a huge amount of dirt caked in the fans of the motor. I've seen a good number of these machines in the last few years, all have had the issues, the people leave them and buy a new machine. When the customer leaves, I throw the machine away. If I EVER find one without issues, I'll let you know.