- Traffic prioritization (real-time, prioritized, background), and access profiles (per-device data budget, filters, max online time).
- Per device statistics on max data rate, current throughput, Wi-Fi standard, encryption, signal properties (e.g. MU-MIMO or not), etc.
- Special LAN port for guests, without access to the rest of the network (good for that ad filled smart TV).
- Extra LED with customizable function (can light up if there's anybody in the guest network, or a device plugged in the USB, or data cap is exceeded, etc).
- Energy consumption graphs for each major component (CPU, Wi-Fi, USB devices, etc).
- More information about my DSL cable than I know what to do, including spectrum graphs, line attenuation, latency, and even approximate line length.
- Security diagnostics with provider info, firmware status, login credentials type, open ports, egress filters, Wi-Fi security, etc.
- Also has features for smarthome, telephony, NAS, and media center, but I've never tried those.