I find the vibration function, along with quiet has more of an effect, or a muzzle shake with quiet. If a Nick is used I still give a Quiet command. I don't think the dog is really aware that it's making noise. Vibration/muzzle shake sort've snaps the brain out of it, stops the under the breath whine without the confusion of a command. Of course you got to be in a mind state to correct it, and I don't know about you but @ O'dark thirty I'm more concerned with Coffee, getting decoys and everything else out to the blind and setup before, that first bit of sun-light comes up. I don't really have the time or patience to deal with whining, which is probably why it seems so loud an annoying ;).

