Rated 3 out of 5 stars
Highest quality is 224kbps, which is an odd number. I am used to having it either 128 or 256.
The layout under the video is bad, it pushes all of the other content down so it can have space for it's large icons and giant blue help button.
However, this addon makes it so you can download directly from the youtube site without having to go to a 3rd party, which is great, so upgrading from 2 stars to 3 stars. (4 if the layout is fixed, 5 if the quality is fixed to support 320kbps)