I receive this item and have make arrangement to cable service start . what I think be interesting be the tech from Comcast say this device be completely unusable since the serial number have be register elsewhere I have to rent a unit from he . after a couple of day , I call the service department and while on the phone he tell I all I need be the MAC address and they would take care of the rest . well , needless to say , the unit work great ! be even able to connect my router to and set up my network with no issue . what be Comcast think ? well , when I get my bill they overcharge I for the service I sign up for and keep the rent charge on the bill after I return they modem . the modem work great and I be glad I make the purchase !