I do not see a use for a USB soldering iron. I normally avoid chinese and japanese crap, but I do have a nice Hako hot air station. It has a decent(not great) soldering iron, and the hot air has come in very handy. I also have a Kado soldering iron on the side. Those two together, along with an inspection microscope, optivisors, etc, I have not found a project I can not tackle.