Excellent, but one important thing is missing... Rated 4 out of 5 stars

This is a 5-stars add-on. However I gave it 4 stars for one reason : it doesn't allow for 480p formats, which is the highest resolution for many Youtube clips that aren't HD (720p and more)

This review is for a previous version of the add-on (3.0.5). 

Very good integration Rated 5 out of 5 stars

The button is where it should be, it looks and does as it should. The only little deception is that it doesn't recognize 480p and 1080p., but all other Youtube downloaders have the same limitation : YouTube switched to adaptive streams striping audio from video which then need to be merged throughout client side (it requires a different technique than simply looking up for a video file).

This review is for a previous version of the add-on (2.2.9.1-signed).