It is good, but I find Downloadhelper, an add-on to firefox, easier to use
and it can download any flash video from anywhere.
https://addons.mozilla.org/en-US/firefox/addon/3006

I still use youtube-dl

For installing it,

sudo aptitude install youtube-dl

Then, for downloading a Youtube video, copy the URL of the video, then open a
Terminal window, give the command Youtube-dl and hit Space then paste the URL of
the video, then hit Enter. It will download the video in .flv format to your
Home foder. It is a nice, efficient program.