I've been using the app since launch without issues (outside the app features that need work and have already been addressed in the forum. I am on X1 triple play (200mb/s) internet on a hard wired Roku 4 to a Samsung KS8000 using HDMI ARC to a JBL Soundbar. Using my own arris TM822g emta modem and X4S netgear router. No sync issues and all channels work perfectly. No pixelation or anything to report. I'm happy with the app so far (Once additional features are added in), but, won't pay for it if that is a requirement.
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