Thanks for the links....

I guess what I mainly looking for is the basic function. For example, if you get a cell phone, it is worthless without a contract with a service provider. The device and service are both required. In the case of Roku, I am just wondering if there is a similar relationship....or can you just buy the device, hook it up, and view stuff without contracts or subscriptions. I understand you can improve the experience by buying channels as you go.

I am completely ignorant of these TV devices as a whole. After FedEx delivers it, and I hook it up and turn it on....what's going to happen. Anything?