I just discovered Channels and am very interested in it.
Right now, I'm still committed to Tivo and Comcast since Tivo is installed and paid for. I'm using some used lifetime Tivo equipment combined with PlayOn. It seems Channels is a next generation PlayOn if I understand the bits and pieces I read about Channels.
Channels is definitely where I will go next after what I am currently using looks old. $80/year is just fine for easy delivery combined with the extra it offers.
That being said, it still needs a little smoothing out so it can become wife-pleasing. I have a 24/7 home Windows server for media and more. Channels looks like it can provide a nice interface to anything I may want to see with one big exception.
Currently PlayOn has a Roku app. It appears to be an interface to the PlayOn server. Basically it's a media player with commercial skip for anything I have already recorded. I think it uses VLC for media player duties. The Roku app is basically an interface. I'm pretty sure the Window's PC does much of the work.
If Channels only concentrated on using Roku for playing apps, as opposed to using Roku as a mini pc, then Channels would have a much wider potential customer base.
Perhaps it would require Channels for file servers and Channels for PCs as two separate offerings?