Rated 5 out of 5 stars

Works great!
We even use this to share contacts between office associates. Just make a separate contactsbook for the contacts you want to share, make a separate account on Google and install this add-on on every machine. Works better for us than the SyncKolab add-on because it can be set to send and receive updates automatically.

This review is for a previous version of the add-on (0.5.56).