I needed to cut 2ft x 2ft window openings in several steel doors and decided to try one of these instead of fighting it with a saber saw. I expected the foam core to cause problems, but after quickly cutting through 48 feet of steel in the doors, it still cut great. Since many complained about the small, sharp shavings the tool creates, I used a shop vacuum to collect them as I cut. I just spent my money on this project and it still works like new so I'm very happy with the purchase and am looking for other things to use it with. Runs quieter than a saber saw and has no bent, broken or worn blades. Definitely recommend this if you have sheet metal work that doesn't lend itself to the tools you already have.