Im using a a $199 tivo roamio with my wowway digital cable service without any issues and without installing a cable card. Since I have digital basic i get all 99 SD channels and the 10 local HD national network channels. Although initially it complains that a cable card is necessary to tune in most of the channels, a channel scan pretty much fixes that. I use the same setup with a Tivo Premiere XL-again no cable card and all works well as it does with three other Series 3 HD Tivos. Im thinking about going to the plus for six tuners and streaming and wonder if anyone else has been successful in doing a similar setup with a Roamio and if it will work since it differs by the fact that it doesn't have a OTA tuner (even though my cable is in fact plugged into the cable input). I remember once trying series 4 that no matter what i did, without a cable card, i couldn't get it to work without a cable card installed. I gambled and tried the Roamio and it worked, I'm hoping a plus will work just the same.