I wasn't expecting the Ethernet ports. I would love to be able to plug this in an know in a second what tagged vlans are preset, what addr/mask the DHCP server offered, is PXE an option? blink an LED if there's a new RA, ipv6 neighbor, etc. Blink an LED if there's been a 802.3x pause frame in the last 500ms, or 802.3Qbb while we're at it. With the pair of ports, let me MITM so the 802.1X negotiation can take place before I start sniffing.
More ideas:
let me build an ARP table, then give me a button to send WoL packets to host(s) of my choosing.
Let me generate p0f fingerprints on MITM'd traffic.
you are not getting ARP of hosts that are sleeping in WoL waiting to be ran
You do know they make proper network troubleshooting tools, right?