So I just did some testing of the playback and it actually looks really good! I have setup some recordings for tonight and will check those out as they are done recording.
Issue: On the Nvidia Shield, all of the channels show up under the "On Now" tab but the new channels aren't showing up in the Grid guide tab. The only channels showing up there are my usual OTA channels.
By the way - I am not sure why this would be, but I signed up for the Spectrum TV Choice package which gives you your locals live and 10 cable only channels of your choice, which I did select. However, I am getting a ton of other channels that are actually working! Where I thought I should only be seeing the 10 I selected I am seeing all the other channels as well. I hope that keeps up!
Really great idea you guys have here.