I bought this for a job on my truck, because I saved more on labor than this thing cost. It’s not magic and can be awkward, but it does get stuff hot. I never could have removed some of the nuts and bolts without getting them real hot, and I didn’t want to use a torch.
Once you get the coil really hot, one touch against something will crumble the white insulation off of the coil. Also the coils are just solid copper wire and it would be easy to make your own coils for custom application, and these coils can be easily bent at an angle to reach a tight spot. All in all, a useful tool I’ll probably use a lot since I also work on old rusty tractors a lot.