I use a dedicated playon server, and want to point out that you are incorrect about only being able to view on your local network. PlayOn has mobile clients (I use the one for IOS) and a browser based access method via m.playon.tv. You need to access your playon server from your local network once from your mobile device, and then you can access it from anywhere you are connected to the Internet. I use the browser based access on my netbook when I travel. It of course will only work as well as your home internet connection and processor allow.
-Pearl
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