It works pretty well so far and it also doesn't seem to slow down the navigation.
I really hope this add-on will be regularly updated.
It does a good job at hiding all those distracting (and often annoying) features of Youtube and it could potentially boost your productivity.
I wonder why there are so few add-ons that do this, it seems like a pretty simple task and yet so useful.

I do have a small complaint: if "Hide Recommended videos" is checked, when you browse through a channel and go under "Playlists" nothing shows there.

Thanks to the developer.