So now I've pondered it, I remember the problems with Anker products which can be made worse in this situation.
The problem with Anker's design of the Powerport 2 and 4 is the alignment of the power pins blocks other power sockets. I can see why Anker designed it that way so the weight of the item will keep the pins unfolded. The preceding products had static non-rotating pins and they were are right-angles so larger (and more dangerous to items stored near with protruding pins) to store but could be used taking up 1 plug placement. This means you must place it last in a line of sockets and then you might run into other problems like built into a recess in a office desk there isn't the space, or it accidentally turns off a gang rocker (strip of sockets, with an on/off rocker at the end). So this has meant I never bought the Powerport 4, kept at the Powerport2 and the Aukey.
The other problem is weight and hotels/flights. The typical USA plug in a heavily used place like in a hotel is so worn/loose that anything of weight falls out. Classic one for me is under-seat power on flights, and hotels. This kept me from the Powerport4 and to the Powerport 5.
So this is why I kept with an Aukey 2 port for these situations and I also use a Powerport 5 type where the cord is the wall and little weight on the wall for when I need "more".
The combining of a battery with a 2-port has these same problems made worse, you (like the Powerport 2, 4, etc) must place it at the lowest of the available ports hoping there's space there to fit, it blocks more ports (taller than Powerport2) and is heavier (than Powerport2). So it won't suit all situations.
I'm not writing this not to say its a good/bad just to share me experience to anyone who has, well, less experience in the situations I outline of hotels, flights, offices, etc.
I'll probably buy one anyway, its more useful than just a Powercore 5000.
Photos to show typical problem.