Rated 3 out of 5 stars

I love the format and features of Lightning, but I don't use it. Why? Because, as far as I can determine, I can't integrate it with google calendar, which allows my wife and I and our children to share a global calendar that is also available on our mobile devices.

This review is for a previous version of the add-on (2.6). 

There are actually two ways to integrate with Google Calendar. One is using CalDAV, the other is using the extra extension "Provider for Google Calendar". You might want to try the extra extension, as the CalDAV method is currently broken, as we have to adapt to some server changes.