Rated 4 out of 5 stars

I suggest to point out in capital letters that CalDAV integration with Google calendar has some big issues since some days (very likely on Google side), and that a good and easy solution is to install and configure the Provider for Google Calendar Extension.

I was about to dismiss Lightning, after many years of contnuous usage, since I wasn't able to dismiss my alarms any more.

Now I'm very happy not to have to.

This review is for a previous version of the add-on (1.9.1). 

Note that the Google Calendar Server issue was fixed, it should now work without issues again.