Yeah and No.

No trouble.
I used Syncevolution succesfully on my friends N900. But he has 60 contacts and 4 calendar entries. We synced just the contacts as MfE wouldn't sync them up to google.

Yeah trouble.
When I tried a few months back it didn't work on contacts after about 250 of them synced ok. Will try again as a test later this evening.

And general answer:
I am using erminig-ng to sync other calendars than the main one. Then MfE for the contacts and main Calendar. Every now and then I have to remove all my contacts and n900 calendar and do a full sync to keep it working.

A better alternative would be of my liking, especially an open one that we can fix ourselves. Erminig and Syncevolution aimed to be those but still have some problems. If I would have the time I'd take a look into them. Maybe some day I will.