The ASUSWRT foundation
Merlin keeps the general ASUSWRT administration structure, which helps experienced ASUS router users transition without relearning every page. The value is in added control, refined behavior and compatibility with established scripting and add-on workflows.
VPN and policy routing controls
Supported builds can provide advanced VPN client and server controls. Performance still depends on router CPU capability, encryption type and the VPN endpoint, so configuration flexibility should not be confused with guaranteed throughput.
DNS, scripts and add-on workflows
DNS settings and scripting support are major reasons advanced users explore the firmware. These capabilities can be combined with compatible tools for filtering, monitoring and automation while keeping changes local to the router.
Monitoring and administration refinements
Additional visibility and practical interface refinements help users diagnose behavior, review network traffic and maintain complex settings. Availability varies by router model and branch.
Practical takeaway
Keep changes model-specific, document your current settings, and test one change at a time. That approach makes future upgrades and troubleshooting much easier.