Easy to install and operate with pfsense community edition.  Just downloaded an image file and I was up and running.  pfsense comes with a version of Free BSD as an operating system as this system is bare bones.  You need to understand what you are doing.  That being said, I was up and running in less than an hour with really packet packet moving This replaced my problematic Netgate 3100, also with pfsense.  The Celeron, 8 gigs of RAM and 120 gigs of space makes it a really fast mover for streaming.  I use for two separate networks in my house and that was a breeze to set up.  There is room for one more completely segmented network.  I use IPv6 routing and it works like a champ.  Highly recommended for a bare bones system for pfsense fir walling.