Each local cable company decides whether or not to turn on the features of the boxes they get from Scientific Atlanta or MOT. So Comcast in San Francisco may use some features of the 7100 while LA utlizes different ones or none at all. So you may find issues in one part of the country which do not pertain to other parts. There are also multiple manufacture runs which mean that even 2 - 7100s in a market may not have the same feature set.