Outside of the first round of testing on my Pro, I have been using the Manjaro KDE images from the microSD. Stable, easy to use, easy to update, and provides a better access to software than the original modified Debian.
I honestly believe this a push in the right direction for this device. The only other offering that I would like to see as an option would be Ubuntu or of the Ubuntu family. While I believe that Manjaro is awesome, I believe that an Ubuntu offering would give this amazing device a better chance to become mainstream. The Pinebook Pro combined with Ubuntu, the community, and management services like Landscape can easily make this a go to solution for education.