It's quite nice. Doesn't run pfSense yet, but apparently that's being worked on. There's a version of Arch that runs wonderfully on it though. I bought it a few days ago after reading this[1] guide to try to replace my pfSense router (stupid AES-NI...).

[1]https://blog.tjll.net/building-my-perfect-router/

I was just investigating which distro would provide a smooth experience with espressobin. Looks like I need to give Arch a try.