Xfinity is one of the buggiest systems I have experienced.  These are just a few examples that are at least weekly, and closer to daily.  The box announcing that a station selection has been switched to HD because of preference settings remains on screen, cannot be removed with the exit button or any other button, and the system has to be shut down and restarted.  The entire service needs rebooting every few days, and can take five minutes.   The program guide is so filled with station logos and search options, that simply scrolling down the programs easily overloads the system, causing either incomplete or hard to read information to appear, or the whole system to freeze.  The simple act of entering a station number via the remote is three times slower than the regular Comcast system, in part because entering a station number also initiates other searches.  And the remote is far more sensitive to distance from the box or direction in which it is pointed.  These are just a few of the bugs most often experienced.  True, Xfinity has capabilities not found in the earlier system, but unless you desperately want all of them, this is a terrible trade off for speed and reliability of simply catching some TV shows.  I have the system at no charge through a promotion, but will cancel it as soon as the penalty-for-cancellation period has expired,.