Rated 4 out of 5 stars

Nice extension.
I have been searching for something like this several months.
But, it would be good if you can disable sync for some calendars, etc temporaly, for example, if one of this results in a error, syncronize the others meanwhile debug de wrong one.

This review is for a previous version of the add-on (0.7.16). 

Calendars with errors do not prevent the others from syncing, you just get the error at the end. Furthermore, you can unsubscribe calendars.