In general, the device is not bad. If it weren't for questions with refueling, there would be a clean five. Has some pros: Works pretty well. The hair dryer mode is weak, but at the same time delicate, there is less risk of spoiling the workpiece. Does not require manipulation to select the combustion mode. Without nozzles, this is an ordinary burner, with a catalyst it is a blower, with nozzles it is a soldering iron and its varieties. In all modes, it works stably in any position. Cons below: Something with a filling valve. Perhaps a marriage, but maybe a design feature. It is possible to pour quite a bit, after which liquid gas pours in all directions. Thus, it is possible to fill only a couple of twists for soldering, after which the soldering iron still works, but it no longer even warms up the solder. After refueling, gas often comes out of the valve for quite a long time. Apparently, the valve freezes over and partially loses its ability.