update - just got a new Chinese Android tablet - HBO GO app works with Chromecast on that beautifully.
Xfinity Go app and Chromecast? Of course not!
What's the point Comcast? You're not winning any friends with this stupidity.
Really want me to use your set top box? How bout sell be a decent HD one for about $100 that does live + on demand and no additional monthly fees? Impossible? I think not - if Roku can sell me one for $50.... Otherwise give up and get with the program -- even your "competitor" soon to be co-opted absorbed into the mother ship -- Timer Warner Cable supports Roku for all of their streamable content...
Heh, you could actually make more money supporting Roku -- no need to supply and maintain those darned Cisco boxes. Stick with what you are competent at (in my n'hood anyhow) -- maintaining the cable/fiber plant and the "back end"