I'm seeing it, but it times out while trying to sync. Sometimes it tries as many as 30 - 50 times before it gives up and leaves me with just my name in the .mac address book. Maybe they're still tinkering.
And yes, I have iSynced with .mac first.
Yea, doesn't sync for me either. According to the help, you need to switch it on in your Address Book preferences page, but that option doesn't appear to be there yet.
In fact I can no-longer even get to the page where I should be able to turn on syncing By the way, posting from Safari - it seems good and solid so far.