Since I thought you just switched from Nuevasync to erminig I thought it would just work. Well, it's not so easy.

I manually deleted all the duplicate and triplicate entry at my google calendar, and after that I found that nuevasync did not synchronize any longer.

So, I thought I would just switch to erminig and download only from google. But after a few sync's emiring deleted some entries on my N900 calendar (while they are still there in my google calendar)

So I guess this is not really ready for Extras-testing yet.

EDIT: Sorry. The reason that Nuevasync stopped working (even before the end of the newly introducted grace period) didn't have to do with Erminig - I caused that myself. The other problems I encountered most certainly had to do with the fact that my local calendar was not empty before the first sync. I think promotion to Extras-testing should come with appropriate warnings of 1) to back up all local and remote calendars and 2) to start with empty calendars in the N900.