I think xfinity stream on the Roku device could really be a great app - eventually. I do have a few suggestions for improvements though:
the content in the live channel guide takes a long time to update as you look around. Could some of that be preloaded and cached in the app so it is available instantly?
Can live tv channel guide start in favorites view or in the last view you used (instead of "all channels"?
Add “watch channel” option when clicking a show in channel guide view even if you are not in the currently live timeslot
Delete a recording requires 4 clicks down and starts in "recording options" - 2 too many and the starting point isn't exactly obvious
No preview of where you are during fast forward of recorded content - all other streaming apps have a little window that shows where you are in the stream while fast forwarding
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