Its okay
I usually only go to this app when Im watching a video and want absolutely no ad interruption. There are some problems, however. The UI is very unappealing (i wish it were more like the YouTube UI) and there is no way to access your liked videos. Ive also encountered a problem when trying to refresh the "what to watch" section. It keeps the same videos without bringing new ones...
aidanrf about ProTube for YouTube, v2.5.9