So first of all respect to Revane and 1 day delivery time, just great! Next, this tool is great! It cut through Home Depot's galvanized roofing material like butter. Of course it's quite a thin material, but I don't think it slows down much with 2 or 3 times thicker material. It took a while to get started, but once the complete cutting head is on the material, it's very quick. As others have said, this is for straight lines, it does NOT rotate. I don't know how long this tool will last but I think it will last a lifetime considering how often I have to use it.