I watched a video of Martin Pickering setting up a jet with that Core. Talk about simple!
I've been a Spektrum user since the dx7 without issue. Up to and including there dx18, I could always figure out how to program what I wanted, albeit, not always intuitive. Then I bought an ix12. I think it was so simple to program that I was intimidated by it! At first, I was setting models up with my dx18 and just transferring them to the ix12. Then I ran into some dx18/ix12 compatability issues and was 'forced' to learn the ix12. It only took one model to realize how simple it was! But the android bugs and slow operating system are already pretty annoying.
From what I'm seeing, that powerbox core is on another level. Heard good about the Jeti, too, but not familiar with it.
If you haven't watched this video, I suggest it. Good info about the basic functionality and how it's made programming things so simple: