Motorola SB6121 be one of the best cable modem you can purchase . it be a little pricey compare to other option out there ; however , believe I , it be worth it -lrb- not to mention you save on the `` modem rental fee '' -rrb- . with Docsis 3.0 , it provide the best speed you can get from you cable provider . I be get double the speed I be promise -lrb- about 36 mbp -rrb- . setup be really easy . take it out of the box ; connect the coax cable , Ethernet jack and the power and that be it . the modem do its magic -lrb- it restart itself 3 time as it establish the connection -- I be a little scared but I think this be necessary for it to establish the correct speed -rrb- and I be connect to the internet in less than 5 minute . please note that this be my first time have internet service with my cable service provider -lrb- I hear that if you already have a modem and replace it , you need to call they and give they you new serial number and the MAC address , which can be find under the modem -rrb- . I have not have any problem so far . I be also extremely happy about its 1Gbps Ethernet port . I connect a Cisco ea4500 router for wireless connectivity . I need a Gigabit connection to get the most out of my wireless router and this modem provide it with ease . I would recommend this item to everyone look for a new modem .