I own several APU-series devices and run FreeBSD and Debian on them, as well as having tested them under OpenWrt extensively. The build quality is very good, as was the performance. Unfortunately, the AMD GX-412TC SoC is showing its age.
shows that the AMD GX-412TC can only handle ~50 Mbps with OpenVPN under "laboratory" test conditions, no match for the J4105 in the ODROID H2. WireGuard is better, but again, the J4105 more than doubles the throughput.