the sb6121 be a great update to the Surfboard sb4200 that I use previously especially since my cable provider warn I that I be about to lose my service due to obsolescence . the sb6121 be smaller much better ventilate and look better in the black case . the price be good and the sb6121 be east to install . unfortunately the unit have a external transformer that add one more to the mass of transformer power my other component . the indicator light be on all the time green and blue . the flash orange connection indicator light be a little strange but I have get accustomed to it . I would recommend this cable modem to someone .