Rated 4 out of 5 stars
Love it! I set the photo height to 16ch, displaying on the right and it is just ideal. It doesn't steal your contacts or do anything to make you worry. Very nice.
The one change I would like to see would be the option to use Gravatar (non case sensitive) but without having a *default* icon for when one isn't found as I much prefer the simplicity of Thunderbird's default profile icons.