Rated 5 out of 5 stars

Great extension. I use it to synchronize 8 calendars on two different Google accounts. However I have experienced one issue recently. On one Google account, I have added a read-only calendar and used a Google function which is to add a default alarm to all these events. With that, all events on this read-only calendar have a 3-hour alarm.
Both on Google Calendar itself and on my phone (using Business Agenda on Android), I can dismiss those alarms without problems. However, on Thunderbird, I can't. Is there a solution?
Right now, I made a work-around: I imported twice the same calendar in Google and have set alarms on only one of these. I use the one with alarms on my phone and the one without on Thunderbird. Not the most elegant solution.

BTW, I have Thunderbird 53B1 with integrated Lightning on Windows and Provider... v. 3.3.

This review is for a previous version of the add-on (3.3). 

This is a limitation in Lightning, but there are bugs filed to fix it. I hope to get to it soon!

Rated 3 out of 5 stars

It worked well until you reached 1.0.1.
I upgraded from 0.32 straight to 1.01 then to 1.02. With 1.01, I *think* I had lost a few old appointments, but it worked generally OK. Then this morning, with 1.02, I couldn't see any appointments in my main calendar. I newer appointment I added afterwards was OK, though. Interestingly, my second calendar was working perfectly.

It looks as if (for the main agenda), it was following the same fetching patterns that I see on my phone: only the latest changes are fetched to save on communication charges.

I decided to unsubscribe and re-subscribe to my main agenda as if it were a new one.
I click on "Suscribe to... Google Agenda"; then I click to "Next"; then I see the window "Select the agenda"
But that window is blank: no content whatsoever in it, so I can't go any further.

Anyway, I removed the latest versions, went back to Lightning 3.3 / Google Provider 0.32 and I'm back in business.

System info: Thunderbird 31.2.0 / Lightning 3.3 / Google Provider 0.32; all in French
Windows 7 Professional 64bits French
Google account (and therefore Google Calendar) in French.

This review is for a previous version of the add-on (1.0.2).