Rated 4 out of 5 stars

Nice and clean. I'd still like to see two more features in there:
- Feedback! You just don't see what's happening and if whatever was supposed to happen did happen. Something like a status bar message stating "31 contacts updated" or "no updates were needed, address books are already in sync" would make life easier
- Something like an address format specification would be great. All addresses from my phone are (of course) merged in gmails single address field... If I could state something like "%street%\n%zip% %city%" (ie some kind of expression stating the order of all items in that string) to have things ordered properly in TB it'd make things tidier in there.

Still, while Zindus messed up my address book by using an xml scheme only itself does understand, this one worked extremely well.

This review is for a previous version of the add-on (0.3.70).