I've been using Roku streaming sticks for over ten years and it always annoys me when the image freezes due to buffering. I was expecting an Ethernet connection on this Roku Ultra to solve this problem, but I haven't plugged it in yet and there wasn't a drop of buffering. The Roku OS for this 4k device is much faster and lighter. Also, the flimsy remote control that came with the streaming joystick has been replaced with something significantly heavier and twice as thick (I represent voice recognition elements). I don't have Alexa or voice recognition turned on yet, so I can't comment on those features, but I'm very, very happy with this Roku purchase.
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