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Pros
Pro Very functional UI
While not completely intuitive, the swipes and gestures allow for the current video to keep playing while browsing for the next video. Hitting the back button shrinks the current video down and puts it in the bottom right where it keeps playing while you browse for the next video.
Cons
Con Doesn't play background music on iOS
The official YouTube app on iOS doesn't have the ability to play music in the background, so you can't keep listening to music while surfing the web or doing any other tasks.