When it comes to the working of iTunes code generator, in this context I would say that the paid code generators are quite satisfying in terms of working. The promotional or free codes generators sometimes fail to generate codes. If you go with the paid ones you can generate as much codes as you want. But if you choose the free one to go for then, let me inform you that you can generate only limited codes and sometimes they stop working.
In simple words paid code generators works quite well in comparison to the free ones. So, it will be better to choose the paid generators for generating codes whenever you need to. Or if you want to go with the free one then, fist check it out whether it’s working or not and then get it for your device. Get code generators for your device soon before it got vanished from the market.