The Apple TV (2015) works well with the Vizio M-Series 4K Ultra HD Smart TV. Just plug in your HDMI cable from your Apple TV to any of the Vizio HDMI port and you are good to go.
With the Apple TV, not only can you enjoy your TV shows, movies, and music from iTunes, you can also install additional popular apps like YouTube.
Picture quality looks great on the Vizio 4K TV. Too bad the Apple TV (2015) itself doesn't yet support 4K, but if you have a large iTunes library and enjoy using Siri, The Apple TV and Vizio 4K TV is a cost effective option to get a great Apple user experience.