It's extremely quiet. You can hear the motor but even in an office environment it's likely unnoticeable unless you're listening for it and not far from the camera.
Pan/tilt is smooth. It's not hard to control at least in part because it's fairly slow. With typical speed domes it's pretty easy to overshoot your target when the camer is moving 400° per second. With this camera, at 30°/sec max, not so much.