Picked up one of these off Spamazon and installation with RC2 was relatively painless. (I haven't found the "fallback to USB stick" boot command however; that would be nice in case I hose myself, since I DO have the stick with the good initfs firmware on it!)
Having trouble with getting VLANs to work on this thing -- I lose connectivity immediately on the LAN side if I attempt to set up VLAN 1 as untagged, default on the ports (VLAN 3 tagged as well, which I intend to use for a second SSID) both over the same physical jack of course.
Done through Luci it reverts on its own when it doesn't stay linked but if I do it manually (e.g. vi via ssh) using the same config that I used on a RT-AX53U I wind up having to hard-reset since that's an actual change in the config files. Posted a note on it here; is there something difference with the switch in these that makes for a different configuration requirement? OpenWRT on Dynalink WRX36 VLAN Problems