I know you are both focussing on the Calendar syncing but i have been poking around the contact side to test it out more thoroughly. I have about 3500 contacts from all over the world and there are issues with different languages, formats, and more. Working with 3Quid I was able to do sync and on the surface it mostly worked but there were some details that did not. I am new to the Isync plug in world but am currently running a test, details below. It has been running for over an hour and still has a long way to go and there are many errors that have been flagged. Have either of you run this scenario test? At this point in the testing, all my contacts on the N900 have been deleted and it is still running.

Screenshot attached.