I replace the rent Cisco dpc3010 with this model . I get the same download -lrb- 40 + mbp -rrb- and upload -lrb- 4 + mbp -rrb- speed as before . the MAC address change be simple , Charter Communications be able to facilitate it in a few minute while I be on the phone with they . the box say `` Comcast certify only '' , but I can attest that it work with Charter in San Luis Obispo County California .