This Dalek was fully functioning (presumably with a guy inside) and the voice was dead on. I was actually terrified when it spoke to me! But deep inside I kind of find the Daleks to be almost as cute as they are scary so when I posed with it, I opted for a hug.
By the way, my shirt says "Keep Calm and Don't Blink", which worked on two levels since I was at the convention as their photographer. :)