Better than all other YouTube downloaders. It keeps things simple. YouTube now streams separate files for HD video and audio. This addon uses ffmpeg (trusted open source video software) to thread the video and audio together and give you a complete result. No weird registrations required. The plugin parses all the available different video and audio qualities for you to chose from. The only downside is you must go into the plugin options to install the native client and ffmpeg, but that's easy as downloading and running a bat file and pressing an install button.