i be look to upgrade to a DOCSIS 3.0 i do a lot of research and this seem like the best choice , over the sb6120 and the 6580 , because i already own a linsys e2000 . after some troubleshooting over the phone with comcast , i have to exchange it for another modem because it keep restart itself . well the second one be do the same thing . i be not gonna try a third one , motorolum release a bad modem . gonna try the 6120 next , it have the same firmware and docsis 3.0