Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Finally a mirror that worked

These are great mirrors. I tow a 33 ft trailer with an Expedition. I hadn't needed mirrors with our old trailer, but knew I would for the new one. I also didn't think they would make much of a difference, but the law is the law. I tried a different universal mirror that flew off on the freeway. I looked for the Cipa slide over mirrors, but they aren't made for the Expedition, so I tried these. They really make a difference in being able to see around the trailer and they stayed on tight. I had trouble adjusting them correctly and ended up puting a "shim" under one of the feet. I used a piece of rubber shelf liner. That worked perfectly and I am very happy with the product.