Eh. As you said, I don't care if they're assholes. If it's better, I don't have a problem using it. My firewall blocks all incoming connections so I don't have a real complicated setup. Now, with the additional features of pfSense, I've been using its DNS server, Load Balancer, NTP, and DHCP services for my internal environment. I've checked out some of the stats and cast syslog to my internal syslog server but nothing much more than that.
Throwing OPNSense up as a test isn't going to be a big deal and who knows, it might actually be better (for what I do).