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Unlike Samsung's 2015 4K TVs for now, Vizio also has a working UltraFlix app. I fired it up and plunked down $10 for a 48-hour rental of the marquis title, "Interstellar" in 4K (otherwise the selection mostly Kung-Fu, concerts, flotsam and older films like "Fargo" and "Robocop" . In the app's favor, it looked great, visibly sharper than the Vudu HDX stream I compared side-by-side. I didn't have the chance to compare it to the Blu-ray, but I plan to soon. If UltraFlix can somehow get more worthwhile content, it may grow into a viable 4K streaming competitor to the likes of Amazon and Netflix.

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