I have a newer Vizio TV with Roku built-in. I also have several other "dumb" TVs with Roku boxes and have used Roku for many years. I use the Xfinity app a lot. I prefer to use the lower channel numbers(2-15) on the guide because they mirror the channels available when using antenna TV. Channel 2 on the Xfinity guide is the same as channel 2 on antenna TV. Several times a day, when navigating the Xfinity channel guide, it skips to the equivalent broadcaster in the 10xx range. Example: Say I have selected channel 2, ABC, the app will skip to say channel 1006, ABC. Now the only way to get back to the lower channels (because there are no number buttons), it to hold down the arrow key and skip back to the original selection, channel 2, ABC. But this take a couple of minutes to go back through the 900s, 800s, 700s, and so on. I haven't tried this with a Roku box and a dumb TV. Not sure where to post this feedback so someone can look in to it? Is there an updated app that can be downloaded?