Instruct: Classify Amazon reviews into positive or negative sentiment
Query: HORRIBLE!

In theory, this should have been a great product. Unfortunately, it was COMPLETELY WORTHLESS! I don't know how people could possibly subject their dogs to this. When setting up the boundary flags, the "boundary" was completely random. Most of the time, I could walk a block away and never have the collar go off. Other times, the collar would shock when I was 10 feet away. Absolutely ridiculous.I called customer support. The lady helped me to trouble-shoot, but we didn't have any luck. She told me that if there are any wireless networks nearby or any burried cable or electric lines, they could affect the performance. ???? !!! Are you kidding?! In this day and age, where ISN'T there a wireless or burried cable/electric line??Unfortunately, it looks like we are going to have to get the regular type of electric fence and hope that it works a LOT more consistantly than this.