Customers on X1, a video service that features a cloud-based user interface and access to apps and other new elements such as in-home video streaming on PCs and tablets and acloud DVR, also require new boxes.A Comcast customer who was alerted to the smaller upgrade fee for X1 noted on the DSL Reports message board that the price drop -- from $49.99 to $19.99 -- became effective on March 3, 2014, w