Anyone using a cheap fuel, like Ronson's, will eventually have problems. These fuels are full of contaminants and oils.
Some of the higher-priced butane-powered lighters and jet torches incorporate micro-sized components with extremely precise tolerances. Smaller valves, orifices, and other fittings on these devices require clean fuel with lower levels of contaminants in order to deliver consistent, reliable operation. Premium butane fuel is also recommended for torches used at higher elevations (altitude).
Accordingly, in an effort to achieve a lower level of contaminants for purity, butane fuel, at a minimum, must be triple refined. Triple refined premium butane gas refills are always highly recommended by manufacturers of butane gas lighters and jet torches.
Also, the more refined your fuel is, the hotter and higher the flame will be ...
... why take chances on crap, when you can get better for about the same price?