Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible quality control

The concept behind these pipe clamps is great, but I had exactly the same problem that Dana Vogel did (we're not related). Specifically, the clutch plates on the fixed side were installed upside down so that the long tabs point down. As a result, the clamp cannot lay flat, which completely defeats the entire purpose of these clamps. There is absolutely no excuse for this kind of obvious mistake, and a company with a reputation like Irwin should never, ever have allowed this to happen. The fact that another person here experienced the same problem leads me to believe that Irwin has enormous quality control problems. I will definitely be returning these. I plan to replace them with the similar ones recently released by Rockler even though the Rocker clamps require a threaded pipe.