Review (5/5): Seems to work okay...
While this thing doesn't completely shut the neighbor's dogs up, it does seem to make them yap a bit less. Instead of them constantly yapping constantly day in and day out, they simply now yap once and usually the silence remains for quite some time until they decide to yap at something else. While it's not perfect, it does make a significant improvement over the current barking situation and aside from the neighbor trying to retrain their dogs, I think this item is doing its job just fine.