The problem is that QR codes are used to replace simple (static/generic) URLs. If you have a usage where there is potentially a wide range of values, they becom

The problem is that QR codes are used to replace simple (static/generic) URLs. If you have a usage where there is potentially a wide range of values, they become more useful, but since they're being used in mass printing / advertising, they're going to be the same all over and in that case you might as well just use an easy URL. QR codes work great when being used in items where there is a large (think 100,000) number of potential unique values. That scale means they shouldn't be used for a product SKU, for example - they should be used for a specific object like a SKU/serial # combo. Never enter a serial number again to register a product, for example.