There are a few kinks to work out, but app has been running well on my iPad and iPhone both within wifi network and on streaming. A little bit of buffer delay. However, to see the program guides and allowing a single app to view all of your live cable subscriptions its a pretty cool app. Im not a big fan on the movies on demand page as the layout is a bit funky, but for live streaming its great. A nice add to your cable subscription. I did not have any of the issues as some other reviewers noted.
IT worker about Xfinity Stream, v3.5.1