Nice review and testing! I too have the Fusion 5K - Bought it back in March '17.
It is built like a tank. Perfect for travel, no need for multiple wall sockets. 5000mAh is perfect to get you over that "hump" when you are away and need a little more juice.
I would love to see newer versions of these, possibly bigger capacity or USB C, PD, what other features would you want added to an all in one charger/powerbank?