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 do know they make proper network troubleshooting tools, right?