Doesn

I have a Macbook Pro with OS X El Capitan Version 10.11.1.

There is no Full Screen mode. When I click the Full Screen option as one would normally do on Youtube, I get an Unavailable notification.
After one or one and a half hours of use, I get Ads showing up before each video. This happens even though I selected the block ads option in Preferences for the app.
Sometimes the app freezes midway during a video even though my internet connection is fine and no other app is in use except Go Youtube so I know its not a memory or CPU issue.
Last even though the User Interface is basically the exact same as when you watch Youbube normally, the fact that when I go to my Watch Later list, I have to actually click on the row to view the "X" to delete a video from my playlist or to see the "Move to top" option is really annoying. Especially when sometimes, it will interpret a single click as a double click and play the video instead of displaying me the delete option or the option to move it to the top.

You would think that it would use the same On Hover effect like Youtube does normally.

Its true that when it works, the video is seemless. But the cost of all of these glitches isnt worth it. Epecially when its only worked less than half the time.
Ill be trying something else.

PoliTech-er about GoVid for YouTube