For anyone curious, Siri works great with Ford Sync. However, you do have to hold down the home button to start talking to her (then she should come on over Ford Sync as if it was a bluetooth headset - reading you everything and not expecting you to look at the screen at all). The only issue is that in my cars (my Mustang included) the "phone" area is closed off, making pressing that button a bit impractical. I'd love to see some sort of Bluetooth "home button" that I could stick somewhere easily in reach in my car. Sadly Ford Sync doesn't have any generic bluetooth button, it wants to do everything itself.