I'm using pfSense Plus, which has several features I like, such as the ZFS boot environment. I support Netgate because they're one of the biggest contributors to FreeBSD, so I'm happy to contribute. The most valuable feature to me is the gateway failover. The area where I live has a lot of natural disasters and times when my Internet connection will go down. I work from home sometimes, and my wife works from home all the time, so it's essential to have a reliable connection. I like that it can automatically pick the connection based on packet loss.
The flexibility seems to be excellent. It has a large set of features to choose from that are built into the UI, so I can do 99 percent of it through the interface. It's also nice that I can run it on my own hardware. I don't necessarily need to buy a Netgate appliance, even though they make good products. It's nice that I can run it just about on any x86 PC with a dual NIC.
If we're adding a plug-in to the pfSense platform, that can be difficult, but I don't mind because Netgate vets the plugins before they make them available. That said, I found FreeBSD easy to deploy, and adding custom packages to it is simple.
It doesn't prevent data loss in other machines, but pfSense has ZFS built in and can mirror it in two disks in different boot environments. If I have a corrupt OS, a bad update, or something else that goes wrong so that I can't connect to my Netgate, that's something built in so I don't have data loss on my firewall.
The dashboard is extremely easy to use. I like that I can go to one page and see the status of my hardware, packages, gateways, interfaces, disks, RAM, thermal sensors, and traffic graphs. It's a one-stop to look at each item and see everything operating properly. I can see them in different menus in the UI, but having one page where I can view them together is nice.