I can access the HB710 through its IP address and sign into it using the password on the sticker at the bottom of the router. When in EasyMesh mode, it doesn't have much. I can run speed test, see the bands its connecting on to the BE230 (5Ghz) and the bands that it is offering 2.4Ghz, 5Ghz,6Ghz. MLO seems to be off. I can also get basic information on the clients that are connected to this, which is also on the main router's easymesh interface. Other than that there is an option for firmware upgrade.
So the 6Ghz band is working, but because the BE230 doesn't have 6Ghz, the HB710 offers it on a separate SSID which isn't part of the mesh i.e., the HB710 offers the SSIDs of the BE230 controller and its own 6Ghz SSID. It's actually good for me because I connect my Mac at 6Ghz, while it meshes with the BE230 at 5Ghz. No overlap.
I've tested the speed of the 5Gz mesh link at a close distance and it's just over 2Gbps. Through two walls, it falls to 400Mbps. My Mac is WiFi 6E, so it doesn't have 6Ghz 320Mhz channel hence if I ever want to experience > 2Gbps connection with a capable WiFi 7 6Ghz client, I'll have to use Ethernet backhaul. So yes, I'm currently limited by the BE230's 2.5Gbps ports and my 3Gbps BB even though I do have a 10Gbps NAS (which I can access through a separate LAN cable). I plugged the Mac's 10Gbps thunderbolt dongle into the HB710's 10 Gbps port to determine the HB710's maximum wireless mesh speed with the BE230, and that was 2Gbps.
The main reason the HB710 is not the mesh controller is I need a Wireguard VPN server, which the BE230 has, on my main router and the HB710 doesn't (none of the Aginet do).