Dirk, it works fine for me. Am I correct to assume you are trying to use voice command while using yout BT headset? Make sure after you press the button that you first hear the beep from the BT headset, but then wait for the "reply beep" in the earpiece from the phone acknowledging you can start to talk. That delay is a period where if you start to talk, it isn't yet listening.

It works fine for me with a very cheap (read: $20) Motorola BT350 headset, so it should work even better with nicer BT headsets. I've found VC works flawless with the new upgrades, and it even does a fairly decent job reading new message aloud if you so configure it. Nice!