Me too, mine arrived yesterday, but the 48W switching power supply arrived today. Only the installation was a bit fiddly. I had copied Armbian_5.65_Nanopim4_Ubuntu_bionic_default_4.4.162_desktop to an SD at the end of October and transferred it from there to an eMMC using armbian-config. In December I had packed a mSATA SSD into a USB3 case, connected it to the NanoPi and very conveniently, with armbian-config, integrated the USB SSD so that it boots from the eMMC.
So far so good, I was satisfied with this solution. When I then installed the SATA HAT, the NanoPi didn't want to boot from a current Armbian Ubuntu, nor from an Armbian Stretch, nor from an older version, as long as the eMMC was installed at the same time. Then I installed an SD version of Friendly Core Bionic and repartitioned the eMMC. Then I could boot normally with Armbian_5.75_Nanopim4_Debian_stretch_default_4.4.174 from SD and set up the eMMC first, reboot and without SD, set up the SATA SSD in a second pass. Fiddling with a SMD tweezer to insert or remove the eMMC under the SATA HAT was a bit annoying. But with the RockPi 4 it's even narrower under the cooler.
It wouldn't hurt to ask Libre Computer and point out that their not-so-successful campaign (around 68% of target reached) might have been successful if they would have broad and stable support from Armbian.
That was the main road block for me - the software. The fact that they promise mainline kernel, starting from 4.19, actually made me buy it. All ARM devices are sketchy in this regard. With mainline support, I can use the device as long as I like, without falling behind and stuck with old kernels.