Pleased with results immediately
We've owned this collar for the most barky of my three dogs for two years now, and I just ordered a second for my #2 dog about whom we recently received neighbor complaints. The collar has completely changed #1 dog's obsessive behavior with trucks and vans. She now only makes a low rumbling sound in her throat (while still running back and forth on the rock wall), instead of the incessant barking of the past. I replace the battery about twice a year. Perhaps the collar Rocky used was defective in some way? I hope s/he made a call to Petsafe before giving up; they have very helpful customer support. We've had their wireless fence system for 4 years now. The bark collar's fit needs to be right, and if the dog is still barking, perhaps the intensity needs to be moved to the next highest level. The medium level works fine for my obsessive barker. Bottom line - I'm really glad for this product, which allowed us to keep our dog, while knowing she won't get shocked by another dog's bark.

Worked great-- for 2 months.
Did everything I wanted it to for about two months, working better than similar products. Then the battery quit. Replaced the battery, then it quit working altogether. Despite this, I'm ordering another one and hoping it will last longer this time. At least I still have spare batteries left over from the last collar.

I think this is a great product that suffers from either poor quality control or design flaws.

The verdict is still out
I'm having trouble getting this collar to stay in place, so I'm really not sure it will ultimately serve it's purpose. The company sent me a different style of collar to try, but every time the dog shakes his head, the contact points move out of place. The company said I need to make it tighter and to make sure I put it on when he is standing up...I've done both. I simply can't make the collar any tighter as it's already a struggle to snap it shut as it is. I'll give it a few more tries, but I have my doubts as to how useful it will be.

Great Bark controller
Have some small dogs and they can be yappy but this does the trick
keeps the barking to a minimum. Can't do with out it!!!

bark control
I purchased the automatic bark control collar and it worked as advertised for the first two weeks. It then stopped working for no apparent reason.
I called the company and they agreed to replace it free of charge.
I have read others comments on this brand of collar with similar results, I was hoping it was a fluke, I guess its a definate issue.