I agree with this product -- not because it stops barking, but because it's a humane way to do it. There are so many products out there that are so much more cruel than this. One of the most common things I see nowadays are dogs with their vocal cords removed. I bet if their owners heard of this product they would have thought twice. I think it's great that they're finding more humane ways to do things, whether or not the potential result seems "stupid."

Edit: The plug-in looks cool. I might get myself one of those one day. A piece of clothing of your's to smell might calm the pup down too.