I have a rotheberger cutter for over ten years that still works, and I bought this one for a change (and because it's low cost). It has an easy blade opening by lightly pushing one handle outward, good cutting (it's still new), and it works on ppr and aluminum. But after two weeks of use, the spring that returns the blade broke while I was working, so I had to fix it. Besides the time it took to fix it, I don't know what consequences it would have had if I had to return it and they saw that I had fixed it. Personally, I believe that the problem is not a defect in my scissors but a manufacturing issue.