Love/hate with the Fusion. I like it combined charger with battery so removes a cable but don’t like its size/shape it needs a good and accessible socket. So I take it in my work bag to office where I know its power sockets but don’t take on overnight trips to unknown places where I prefer say the Powerport5 which can better tolerate bad sockets.
Fusion makes maximum sense for non-geeks who simply forget or lose things, this is one item which recharges itself implicitly eventually after its recharged your phone. But for that it makes it heavy so falls out of weak sockets (hotels for example where the sockets are often aged loose) and in confined spots (like offices where the sockets are recessed in a desk or under floor).
I’d recommend as a gift to someone who is non-geek, absent minded type as its harder to make it non-functional.
“It’s all you need” if you gift it with one cable to match their phone type (Lightning, MicroB, C). I initially make up a bag kit with a small 12W dual socket charger with microB cable and their device cable and the Mini+ but I found the kit getting split up and the battery used and not recharged when next needed, so the Fusion removes a cable to lose and removes needing to remember to recharge it if you use it to recharge your phone.
Given the Fusion 5000 is now released 10 months ago, given they managed to shrink eventually the Powerport2, I see the Fusion due an upgrade, probably make it smaller and lighter.