I knew when i bought it that it was $20 under all the other sites and that should have thrown up warning signs but i still bought it because the other Doc product i bought (from a store not online) Has been working for 3 years if not more now. But i have had this product less then a month and already the moter is dying and i have to smack it to start moving again. Don't buy these they just plan suck if u want something that is going to last go somewhere else.