We have a Roku in the bedroom and the living room, the living room is wired to the router and the bedroom is a wireless only model. Bedroom does "buffer" on occation but not very often and with 15mbs service we can watch a movie in each room no problem. We use it for Netflix, Amazon Prime/rental, and Crackle. A few years ago I built a home theater PC and the Roku has put it out of business. I still have our library of 150+ dvds stored on it but more often than not we use the Roku for viewing just about everything. My 4 year old son has no concept of the idea that tv shows start at specific times, to him the Roku is TV and everything is on all the time.
Jeff