I run pfSense on this unit, which is a truly superior routing solution. If you have been running DD-WRT-style firmware on proprietary hardware (i.e., prosumer wireless routers), this is a major step up in terms of reliability and horsepower. It can easily process 500mbps traffic through the firewall--which is my current ISP maximum--and terminate VPN traffic at about 100mbs. It will presumably run OPNsense--or your favorite full Linux distribution--without a hitch.The first unit shipped to me had a problem with one of the NICs; Protectli was astonishingly responsive, putting me directly in touch with knowledgable support staff who, after one round of diagnostics, shipped me a new unit.