I have a F700 2.0 - and have never once been able to get VC working properly. I've had it call the wrong person plenty of times, and have it tell me it didn't understand what I'm saying when I try to change audio sources and such, but that's about it.
That's really been one of the biggest disappointments for me in this unit...that and the incredibly sluggish response time to do...anything. Push button, wait 2 seconds for response. Push another, wait 2 more seconds. Rinse, repeat. Oh, and the insanely long boot time.
Oh well. For the price (I got a great sale on it) it's the only