Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Double FAIL

I'm a fairly busy mobile DJ with a solid, three tower lighting setup. I needed to add a bright strobe, and I was encouraged reading the reviews on this produce.You can imagine my disappointment when I received the strobe, and it simply would not work. I contacted the Chauvet tech support and they couldn't get it to work. So, I assumed it was just a defective product and returned it to Amazon. So it goes sometimes, right?I received a replacement strobe within a couple of days...I was really happy at the service from Amazon. That is, until I plugged it in and discovered I had received yet ANOTHER DEFECTIVE unit that would not work.Fool me once, shame on you. Fool me twice, shame on me. I returned it to Amazon today and asked for a refund instead of a replacement. I'm still in the market for a quality, controllable strobe....