I run pfsense on an embedded j3455 atom setup in a 2U box in my rack. Ideally it would have been 1U but I decided on an iStar 214-mATX last minute. Runs pretty well as my firewall, router, dhcp, and dns appliance. Thinking about setting up a VM to test out the redundancy features.
Behind it, I have ~20 devices and probably ~20 more vms. I have thought about looking into 10gb for pfsense but I think its going to be a better use for just connecting esxi and storage devices + 1/2 PCs.
Haven't upgraded in a while come to think about it - missing anything good since 2.3.4-RELEASE?
All overclock, all the time