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You also have issues of protection. You have people using their PC inside your local network (That is why I use a non-wireless cable modem and use my own Wi-Fi router) So I can control who does and doesn't have access inside my personal network.
From the article: "Comcast says the hotspot – which appears as “xfinitywifi” to those searching for a Wi-Fi connection – is completely separate from the home network. Someone accessing the Net through the hotspot can’t get to the computers, printers, mobile devices, streaming boxes and more sitting on the host network."