We have two Roku. The older one (2) has a headphone jack in the remote. It works great when I am watching a game on one tv and the Mrs is watching something else on another so the sound doesn't clash. The latency is almost nonexistent. I can even put the remote in my pocket and wander around as long as I don't get too far away.
For local channels without cable check out locast.com I may have already mentioned it but if you are in the right market you can stream local channels for free with an occasional add to pay $5 a month to ditch the nag add. If it wasn't for the built in DVR and on demand my wife watches I would cancel Comcast TV and go with that. It's too flat and far away for an antenna.
The days of password sharing passwords on streaming services may be coming to and end. I see Netflix is cracking down on it. So if you are watching it and someone else is also from a different IP one of you might get shut down.