I notice the other two review before I mention serious problem with they 4870sz so I think it worthwhile to add my experience . the first one that arrive just do not work . do not pick up dirt . call Eureka customer service and they could not figure out the problem so they tell I to bring it to a authorized service center . that seem pretty ridiculous to I -lrb- I should not have to drag it around to get repair when I buy it new and allegedly work ! -rrb- and I tell the service agent that . then she tell I I also have the option to return it to Amazon . so I ship the big heavy thing back to Amazon for a exchange . Amazon be great because they pay for the return shipping and within two day I have the replacement vac . well this one seem to work pretty well . the only weird thing be that when I first turn it on it seem to move forward on its on like a self propel lawnmower -lrb- which be nice ! -rrb- but within a few minute it become much harder to push . I have not have a chance to call customer service again and ask they if it be suppose to be like that or not . speak of Eureka customer service the woman who I have on the phone seem to know less about the vac than I do after read the direction only once ! that be disconcert . anyway my bottom line be it seem to work fine now for I but you might want to do some more research first . and thanks to Amazon for make the exchange so easy and painless !