I was a little skeptic at first. We have on VERY vocal Labrador and a pit mix but, so far so good. I'll will maybe hear one bark here and there and that's it. Highly recommend it. We bought this because we just moved and we are expecting our first child.
This has worked great for me. I had my doubts but it has worked great so far( 2 weeks) My dog has went from barking all night to not barking no more than 3 times. We are sleeping well now. I am adding this update as of 7-6-13 the collar is still working well but the battery has now died. I am now trying to find a replacement. Still love this product!!!