Sync was only added from around Q3 2012.
My Focus was built 25th May 2012.
I'm actually quite glad from the horror stories I have been hearing, plus I have directional controls for the HU on my steering wheel, which is so much better for safely navigating my usb stick.
Syn has worked flawlessly for me with a 500gig HD connected. The lack of directional controls on the steering wheel bugs me, but most of the down side is mitigated by the voice control, which (despite being sceptical) I've found incredibly accurate and intuitive.
I guess it's a trade-off. The voice control is a lot better for finding music than directional controls, but on those occasions when you need to navigate manually (like searching through a list of albums when you can't remember the name of the one you're looking for), the lack of steering wheel controls is a pain.