After a first look it seems interesting, but there should be added a little bit!
I have already seen about 200 Episodes on my PC, but I don’t see a way to mark them as seen in the Android app, except for letting it play for the full duration. A mark as seen feature should get added.
Also it would be cool if you could login to railscasts to manage the pro and revised episodes also.
But marking as seen is much more important to add I think.