Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Quality poor from Polar

I bought this item, though not from the merchant listed above. I bought in a physical store and installed it, which took hours. I then realized there was a faulty connection. I took it back and replaced it, when through the whole installation process, then again realized there was a faulty connection and also the battery cover did not fit properly.So in short, a great idea, but I had bad luck the two times I tried it with lousy product quality. After the second attempt I asked for my money back.It's a shame - I really wanted this to work as the product is so much cheaper than the alternatives.