I ordered one that arrived today. It came in a rather important looking metal case missing two of the elements listed in the instructions.
I dragged Mrs. Rust into the shop after explaining how these work. Sensing my enthusiasm she follwed me out to watch me attempt to heat an exhaust manifold pipe flange nut. After a couple of minutes she asks "Is somthing supposed to be happening?" This pretty much sealed the fate for this big clunky, underpowered device.
Perhaps Sr. Bezos will find a use for it on his yacht or Gulfstream as he's getting it back.