Re: What does it do...
I use an Asus Vivosmart... thing. Core i5, 100Gb SSD + 2Tb platter, 8Gb RAM, plugged into the back via USB is a TV card which supports HD so can get all the freeview HD channels, also there is a Windows Media Remote thing, all running on LibreOS (Kodi OS basically).
Sure, it's no where near as cheap as the Roku, but with a Roku you can't dual boot into Linux/Windows and play games from your Steam Library, nor do other stuff. It's also totally silent. If you really wanted cheap and quiet though you can just get a Pi and stick LibreOS onto that which is a lot cheaper than the Roku and if you can get used to Kodi it's very focused on what it doesl