Rated 5 out of 5 stars
I absolutely loath LookOut, and since the merger our mails have been moved from Google Apps to Exchange, that has a god awful webmail client.
So I much welcome this extension, though I'd preferred it to be in the core.
About the pricing, though I would've preferred a higher one time fee, over the current yearly model, it's really not that much to continue development.
5 stars from me.