A:AnswerThey do have the option to subscribe to the NBA League Pass, and I can't tell what the NFL is going to do this year, as the app is down for maintenance and will be back the week that regular season starts. So with the NBA, you would need to have subscribed to the NBA League Pass to get that, and with the NFL I suspect that to be the same way as well.
Let me know if you got any further questions.
A:AnswerSo many apps. Netflix, Amazon, YouTube, and SlingTV just to name a few popular apps. If you have a 4K TV, I suggest downloading UltraFlix for 4K movies. You got to buy it!
A:AnswerI personally don't find any real buffering wait time, once I pick something to watch it will say "receiving" and show a loading line for maybe 5 seconds then it starts playing. For those channels that have commercials, it does this each time the series of commercials is over and the show resumes.
A:AnswerDo you have an HDMI connect available to hook up the Roku then yes. The Roku will turn a non smart TV into a smart TV but warning you most have internet access
A:AnswerNetflix content in 4K is available through the Roku 4, but you must pay a premium price to Netflix in order to stream 4K content. The lower pricing tier at Netflix doesn't include 4K streaming and limits the number of streams more than the higher priced tier which does support 4K (for limited content, mostly new series, and a few movies that are available in 4K currently).
Yahoo and some other choices exist that you might find other 4K content through, and other choices are there that offer 4K content at various price points (rental or purchase) - services such as UltraFlix (as an example).
A:AnswerIt's a streamer so when it is plugged into your TV it has all these channel apps that pop up right away. Add the channels you want to customize your settings.