I've had the Nvidia Shield for a couple years now, and highly recommend it. It's a bit expensive if you're not using it for gaming or Plex server (I'm not) but I find it worth it because it's reliable, still gets updated, and generally "just works". It's literally the only content used for my TV now: Netflix, Plex, YouTube, weather, Tinycam (baby monitor), Google Music, and I can also cast from a phone/computer/etc without changing inputs.