I also have the Portapow meter and thus I could see that through this cable all devices are loaded more slowly than by the original cable. Under 1A it is hardly noticeable, but at a PowerBank that I wanted to invite you with original cable 1.78 A in it with this cable but only 1.2 A. It was similar at a Bluetoothbox 1A instead of 1.4A
So the cable is functioning, but if you want a quick recharger should be where to look different.
I use it only sporadically for devices that can be loaded slowly. I bought a set charging cable by another company and am very happy with the charging power.
Conclusion: "Fast Charger" is something else !!