Received my zBitx via DHL yesterday, and powered it up today. ?Used a micro-USB to ethernet connector, and ssh'd in.
To power off without wearing out the barrel connector, I purchased a 5.5x2.1mm inline power switch (for Arduino's).
I first issued a shutdown command, waited about 10 seconds, and then hit the inline switch to remove power.
73, Ron, n6ywu