I tried them out for the first time today with my headset (don't have the camera). I was actually surprised to find they worked flawlessly on my first attempt every time, and I am a non-native speaker.
That said, I'm probably never gonna use them again, because, you know, buttons. The UI is well designed enough that a voice command is never gonna save you time over a couple of button presses.
Have you tried them? Do you use them?
No troll is too much for me to handle. I rehabilitate trolls, I train people. I am the Troll Whisperer.