Version 1.0 is lightning-fast indeed Rated 5 out of 5 stars

Works great with ThunderBird 8.0 (and the updated Provider for Google Calendar add-on). Version upgrade is not trivial -- but well-worth the effort.

Congratulations to the developers on reaching 1.0 after all these years and many thanks, too!

This review is for a previous version of the add-on (1.0). 

Hangs TB8b5, but how do I tell devs? Rated 1 out of 5 stars

The TB addon (in)compatibility reporter also hangs on submit.

The support page http://www.mozilla.org/projects/calendar/releases/lightning1.0b7.html is dead, too, leaving no option to communicate with developers other than here.

P.S. Project home http://www.mozilla.org/projects/calendar/lightning is grossly outdated, and the download section there offers only1.0b5 for TB 3!

This review is for a previous version of the add-on (1.0b7).