Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't Buy

Bought the v4 model and it stopped working in less than 30 days. Finally got a response from the President that said they would refund my money, so I ordered theBoom E (because the v4 worked great for awhile and I was hopeful it was just one defective product). TheBoom E was dead on arrival and now no one will respond to either of my refund requests (going on 30 days of phone calls and emails from my secretary).